Base | Representation |
---|---|
bin | 1111011111110… |
… | …1001000101100 |
3 | 11112022100012200 |
4 | 3313331020230 |
5 | 113114444410 |
6 | 10241101500 |
7 | 1416330213 |
oct | 367751054 |
9 | 145270180 |
10 | 64999980 |
11 | 337664a1 |
12 | 19927890 |
13 | 1060aa36 |
14 | 88c007a |
15 | 5a8e3c0 |
hex | 3dfd22c |
64999980 has 36 divisors (see below), whose sum is σ = 197167152. Its totient is φ = 17333280.
The previous prime is 64999943. The next prime is 64999981. The reversal of 64999980 is 8999946.
It is a happy number.
It is a tau number, because it is divible by the number of its divisors (36).
It is not an unprimeable number, because it can be changed into a prime (64999981) by changing a digit.
It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 180376 + ... + 180735.
Almost surely, 264999980 is an apocalyptic number.
64999980 is a gapful number since it is divisible by the number (60) formed by its first and last digit.
It is an amenable number.
64999980 is an abundant number, since it is smaller than the sum of its proper divisors (132167172).
It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.
64999980 is a wasteful number, since it uses less digits than its factorization.
64999980 is an evil number, because the sum of its binary digits is even.
The sum of its prime factors is 361126 (or 361121 counting only the distinct ones).
The product of its (nonzero) digits is 1259712, while the sum is 54.
The square root of 64999980 is about 8062.2565079511. The cubic root of 64999980 is about 402.0725346207.
The spelling of 64999980 in words is "sixty-four million, nine hundred ninety-nine thousand, nine hundred eighty".
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