56521820 has 12 divisors (see below), whose sum is σ = 118695864. Its totient is φ = 22608720.

The previous prime is 56521811. The next prime is 56521831. The reversal of 56521820 is 2812565.

It is a super-2 number, since 2×56521820² = 6389432272224800, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1413026 + ... + 1413065.

It is an arithmetic number, because the mean of its divisors is an integer number (9891322).

Almost surely, 2^56521820 is an apocalyptic number.

It is an amenable number.

56521820 is an abundant number, since it is smaller than the sum of its proper divisors (62174044).

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

56521820 is a wasteful number, since it uses less digits than its factorization.

56521820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2826100 (or 2826098 counting only the distinct ones).

The product of its (nonzero) digits is 4800, while the sum is 29.

The square root of 56521820 is about 7518.0994938881. The cubic root of 56521820 is about 383.7709046533.

The spelling of 56521820 in words is "fifty-six million, five hundred twenty-one thousand, eight hundred twenty".