64660256 has 24 divisors (see below), whose sum is σ = 131691420. Its totient is φ = 31214848.

The previous prime is 64660243. The next prime is 64660273. The reversal of 64660256 is 65206646.

It can be written as a sum of positive squares in 2 ways, for example, as 57456400 + 7203856 = 7580^2 + 2684^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 33911 + ... + 35766.

Almost surely, 2^64660256 is an apocalyptic number.

It is an amenable number.

64660256 is an abundant number, since it is smaller than the sum of its proper divisors (67031164).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

64660256 is a wasteful number, since it uses less digits than its factorization.

64660256 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69716 (or 69708 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

The square root of 64660256 is about 8041.1601153067. The cubic root of 64660256 is about 401.3708300292.

The spelling of 64660256 in words is "sixty-four million, six hundred sixty thousand, two hundred fifty-six".