56221164 has 36 divisors (see below), whose sum is σ = 142463776. Its totient is φ = 18694368.

The previous prime is 56221163. The next prime is 56221189. The reversal of 56221164 is 46112265.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56221163) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 14982 + ... + 18354.

Almost surely, 2^56221164 is an apocalyptic number.

It is an amenable number.

56221164 is an abundant number, since it is smaller than the sum of its proper divisors (86242612).

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

56221164 is a wasteful number, since it uses less digits than its factorization.

56221164 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3846 (or 3841 counting only the distinct ones).

The product of its digits is 2880, while the sum is 27.

The square root of 56221164 is about 7498.0773535620. The cubic root of 56221164 is about 383.0892315276.

It can be divided in two parts, 5622 and 1164, that added together give a triangular number (6786 = T₁₁₆).

The spelling of 56221164 in words is "fifty-six million, two hundred twenty-one thousand, one hundred sixty-four".