64813990 has 16 divisors (see below), whose sum is σ = 116786448. Its totient is φ = 25898656.

The previous prime is 64813967. The next prime is 64813993. The reversal of 64813990 is 9931846.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (64813993) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8844 + ... + 14416.

It is an arithmetic number, because the mean of its divisors is an integer number (7299153).

Almost surely, 2^64813990 is an apocalyptic number.

64813990 is a deficient number, since it is larger than the sum of its proper divisors (51972458).

64813990 is a wasteful number, since it uses less digits than its factorization.

64813990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6743.

The product of its (nonzero) digits is 46656, while the sum is 40.

The square root of 64813990 is about 8050.7136329645. The cubic root of 64813990 is about 401.6886734230.

The spelling of 64813990 in words is "sixty-four million, eight hundred thirteen thousand, nine hundred ninety".