64039988 has 12 divisors (see below), whose sum is σ = 112241220. Its totient is φ = 31971072.

The previous prime is 64039979. The next prime is 64039999. The reversal of 64039988 is 88993046.

It can be written as a sum of positive squares in 2 ways, for example, as 15904144 + 48135844 = 3988^2 + 6938^2 .

It is a super-2 number, since 2×64039988² = 8202240126080288, which contains 22 as substring.

It is a hoax number, since the sum of its digits (47) coincides with the sum of the digits of its distinct prime factors.

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, 9203 + ... + 14586.

It is an arithmetic number, because the mean of its divisors is an integer number (9353435).

Almost surely, 2^64039988 is an apocalyptic number.

It is an amenable number.

64039988 is a deficient number, since it is larger than the sum of its proper divisors (48201232).

64039988 is a wasteful number, since it uses less digits than its factorization.

64039988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24466 (or 24464 counting only the distinct ones).

The product of its (nonzero) digits is 373248, while the sum is 47.

The square root of 64039988 is about 8002.4988597313. The cubic root of 64039988 is about 400.0832909887.

The spelling of 64039988 in words is "sixty-four million, thirty-nine thousand, nine hundred eighty-eight".