56664399 has 16 divisors (see below), whose sum is σ = 82548864. Its totient is φ = 34288800.

The previous prime is 56664359. The next prime is 56664401. The reversal of 56664399 is 99346665.

It is a happy number.

It is not a de Polignac number, because 56664399 - 2⁸ = 56664143 is a prime.

It is a super-2 number, since 2×56664399² = 6421708228062402, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56664359) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 35284 + ... + 36854.

It is an arithmetic number, because the mean of its divisors is an integer number (5159304).

Almost surely, 2^56664399 is an apocalyptic number.

56664399 is a deficient number, since it is larger than the sum of its proper divisors (25884465).

56664399 is a wasteful number, since it uses less digits than its factorization.

56664399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2678.

The product of its digits is 1049760, while the sum is 48.

The square root of 56664399 is about 7527.5759046322. The cubic root of 56664399 is about 384.0933271966.

The spelling of 56664399 in words is "fifty-six million, six hundred sixty-four thousand, three hundred ninety-nine".