56215812 has 24 divisors (see below), whose sum is σ = 133019712. Its totient is φ = 18474400.

The previous prime is 56215801. The next prime is 56215837. The reversal of 56215812 is 21851265.

It is a self number, because there is not a number n which added to its sum of digits gives 56215812.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 32139 + ... + 33842.

It is an arithmetic number, because the mean of its divisors is an integer number (5542488).

Almost surely, 2^56215812 is an apocalyptic number.

It is an amenable number.

56215812 is an abundant number, since it is smaller than the sum of its proper divisors (76803900).

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

56215812 is a wasteful number, since it uses less digits than its factorization.

56215812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66059 (or 66057 counting only the distinct ones).

The product of its digits is 4800, while the sum is 30.

The square root of 56215812 is about 7497.7204535779. The cubic root of 56215812 is about 383.0770750223.

The spelling of 56215812 in words is "fifty-six million, two hundred fifteen thousand, eight hundred twelve".