56640630 has 32 divisors (see below), whose sum is σ = 137664000. Its totient is φ = 14912352.

The previous prime is 56640613. The next prime is 56640637. The reversal of 56640630 is 3604665.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56640637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9580 + ... + 14319.

It is an arithmetic number, because the mean of its divisors is an integer number (4302000).

Almost surely, 2^56640630 is an apocalyptic number.

56640630 is an abundant number, since it is smaller than the sum of its proper divisors (81023370).

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

56640630 is a wasteful number, since it uses less digits than its factorization.

56640630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23988.

The product of its (nonzero) digits is 12960, while the sum is 30.

The square root of 56640630 is about 7525.9969439271. The cubic root of 56640630 is about 384.0396145112.

The spelling of 56640630 in words is "fifty-six million, six hundred forty thousand, six hundred thirty".