64255257 has 48 divisors (see below), whose sum is σ = 108883008. Its totient is φ = 36080640.

The previous prime is 64255253. The next prime is 64255313. The reversal of 64255257 is 75255246.

64255257 is a `hidden beast` number, since 642 + 5 + 5 + 2 + 5 + 7 = 666.

It is not a de Polignac number, because 64255257 - 2² = 64255253 is a prime.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (64255253) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 122598 + ... + 123120.

It is an arithmetic number, because the mean of its divisors is an integer number (2268396).

Almost surely, 2^64255257 is an apocalyptic number.

It is an amenable number.

64255257 is a deficient number, since it is larger than the sum of its proper divisors (44627751).

64255257 is a wasteful number, since it uses less digits than its factorization.

64255257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 630 (or 627 counting only the distinct ones).

The product of its digits is 84000, while the sum is 36.

The square root of 64255257 is about 8015.9376868836. The cubic root of 64255257 is about 400.5310799897.

The spelling of 64255257 in words is "sixty-four million, two hundred fifty-five thousand, two hundred fifty-seven".