64039864 has 24 divisors (see below), whose sum is σ = 139679640. Its totient is φ = 27445488.

The previous prime is 64039853. The next prime is 64039919. The reversal of 64039864 is 46893046.

It is a super-2 number, since 2×64039864² = 8202208362276992, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 81292 + ... + 82075.

It is an arithmetic number, because the mean of its divisors is an integer number (5819985).

Almost surely, 2^64039864 is an apocalyptic number.

It is an amenable number.

64039864 is an abundant number, since it is smaller than the sum of its proper divisors (75639776).

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

64039864 is a wasteful number, since it uses less digits than its factorization.

64039864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 163387 (or 163376 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 40.

The square root of 64039864 is about 8002.4911121475. The cubic root of 64039864 is about 400.0830327627.

It can be divided in two parts, 640 and 39864, that added together give a palindrome (40504).

The spelling of 64039864 in words is "sixty-four million, thirty-nine thousand, eight hundred sixty-four".