| Base | Representation |
|---|---|
| bin | 100110001010000… |
| … | …000011011111100 |
| 3 | 1122121120100220200 |
| 4 | 212022000123330 |
| 5 | 2302340014221 |
| 6 | 143304443500 |
| 7 | 21602151132 |
| oct | 4612003374 |
| 9 | 1577510820 |
| 10 | 640157436 |
| 11 | 2a9396836 |
| 12 | 15a479590 |
| 13 | a2818ca9 |
| 14 | 6103b752 |
| 15 | 3b301426 |
| hex | 262806fc |
640157436 has 144 divisors (see below), whose sum is σ = 1755673920. Its totient is φ = 196162560.
The previous prime is 640157431. The next prime is 640157467. The reversal of 640157436 is 634751046.
It is a happy number.
640157436 is a `hidden beast` number, since 640 + 1 + 5 + 7 + 4 + 3 + 6 = 666.
It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.
It is a Harshad number since it is a multiple of its sum of digits (36).
It is a self number, because there is not a number n which added to its sum of digits gives 640157436.
It is a congruent number.
It is not an unprimeable number, because it can be changed into a prime (640157431) by changing a digit.
It is a pernicious number, because its binary representation contains a prime number (13) of ones.
It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3700246 + ... + 3700418.
It is an arithmetic number, because the mean of its divisors is an integer number (12192180).
Almost surely, 2640157436 is an apocalyptic number.
It is an amenable number.
It is a practical number, because each smaller number is the sum of distinct divisors of 640157436, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (877836960).
640157436 is an abundant number, since it is smaller than the sum of its proper divisors (1115516484).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
640157436 is a wasteful number, since it uses less digits than its factorization.
640157436 is an odious number, because the sum of its binary digits is odd.
The sum of its prime factors is 356 (or 351 counting only the distinct ones).
The product of its (nonzero) digits is 60480, while the sum is 36.
The square root of 640157436 is about 25301.3326921726. The cubic root of 640157436 is about 861.8445338817.
The spelling of 640157436 in words is "six hundred forty million, one hundred fifty-seven thousand, four hundred thirty-six".
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