56655690 has 64 divisors (see below), whose sum is σ = 167360256. Its totient is φ = 11953152.

The previous prime is 56655659. The next prime is 56655691. The reversal of 56655690 is 9655665.

It is a super-2 number, since 2×56655690² = 6419734418752200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (56655691) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7647 + ... + 13106.

It is an arithmetic number, because the mean of its divisors is an integer number (2615004).

Almost surely, 2^56655690 is an apocalyptic number.

56655690 is an abundant number, since it is smaller than the sum of its proper divisors (110704566).

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

56655690 is a wasteful number, since it uses less digits than its factorization.

56655690 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20783.

The product of its (nonzero) digits is 243000, while the sum is 42.

The square root of 56655690 is about 7526.9974093260. The cubic root of 56655690 is about 384.0736485257.

The spelling of 56655690 in words is "fifty-six million, six hundred fifty-five thousand, six hundred ninety".