56640399 has 8 divisors (see below), whose sum is σ = 75618480. Its totient is φ = 37711296.

The previous prime is 56640383. The next prime is 56640407. The reversal of 56640399 is 99304665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56640399 - 2⁴ = 56640383 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 56640399.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56640319) 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, 9454 + ... + 14235.

It is an arithmetic number, because the mean of its divisors is an integer number (9452310).

Almost surely, 2^56640399 is an apocalyptic number.

56640399 is a deficient number, since it is larger than the sum of its proper divisors (18978081).

56640399 is a wasteful number, since it uses less digits than its factorization.

56640399 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24489.

The product of its (nonzero) digits is 174960, while the sum is 42.

The square root of 56640399 is about 7525.9815971074. The cubic root of 56640399 is about 384.0390924286.

The spelling of 56640399 in words is "fifty-six million, six hundred forty thousand, three hundred ninety-nine".