| Base | Representation |
|---|---|
| bin | 100110011110110… |
| … | …101110111000100 |
| 3 | 1122222211211222000 |
| 4 | 212132311313010 |
| 5 | 2310234303030 |
| 6 | 144021505300 |
| 7 | 21666446355 |
| oct | 4636656704 |
| 9 | 1588754860 |
| 10 | 645619140 |
| 11 | 301487241 |
| 12 | 160272230 |
| 13 | a39abc7a |
| 14 | 61a5dd2c |
| 15 | 3ba2e860 |
| hex | 267b5dc4 |
645619140 has 96 divisors (see below), whose sum is σ = 2012277120. Its totient is φ = 171849600.
The previous prime is 645619109. The next prime is 645619147. The reversal of 645619140 is 41916546.
645619140 is a `hidden beast` number, since 6 + 4 + 561 + 91 + 4 + 0 = 666.
It is a super-4 number, since 4×6456191404 (a number of 36 digits) contains 4444 as substring.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a junction number, because it is equal to n+sod(n) for n = 645619095 and 645619104.
It is not an unprimeable number, because it can be changed into a prime (645619147) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (17) of ones.
It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 550755 + ... + 551925.
It is an arithmetic number, because the mean of its divisors is an integer number (20961220).
Almost surely, 2645619140 is an apocalyptic number.
645619140 is a gapful number since it is divisible by the number (60) formed by its first and last digit.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 645619140, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1006138560).
645619140 is an abundant number, since it is smaller than the sum of its proper divisors (1366657980).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
645619140 is a wasteful number, since it uses less digits than its factorization.
645619140 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 2210 (or 2202 counting only the distinct ones).
The product of its (nonzero) digits is 25920, while the sum is 36.
The square root of 645619140 is about 25409.0365814999. The cubic root of 645619140 is about 864.2886284927.
The spelling of 645619140 in words is "six hundred forty-five million, six hundred nineteen thousand, one hundred forty".
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