64172864 has 28 divisors (see below), whose sum is σ = 145535904. Its totient is φ = 27502464.

The previous prime is 64172833. The next prime is 64172881. The reversal of 64172864 is 46827146.

It is a tau number, because it is divible by the number of its divisors (28).

It is a congruent number.

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, 71174 + ... + 72069.

Almost surely, 2^64172864 is an apocalyptic number.

64172864 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

64172864 is an abundant number, since it is smaller than the sum of its proper divisors (81363040).

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

64172864 is a wasteful number, since it uses less digits than its factorization.

64172864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 143262 (or 143252 counting only the distinct ones).

The product of its digits is 64512, while the sum is 38.

The square root of 64172864 is about 8010.7967144348. The cubic root of 64172864 is about 400.3598095790.

The spelling of 64172864 in words is "sixty-four million, one hundred seventy-two thousand, eight hundred sixty-four".