56157820 has 48 divisors (see below), whose sum is σ = 120992256. Its totient is φ = 21888000.

The previous prime is 56157799. The next prime is 56157821. The reversal of 56157820 is 2875165.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56157821) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 232900 + ... + 233140.

It is an arithmetic number, because the mean of its divisors is an integer number (2520672).

Almost surely, 2^56157820 is an apocalyptic number.

It is an amenable number.

56157820 is an abundant number, since it is smaller than the sum of its proper divisors (64834436).

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

56157820 is a wasteful number, since it uses less digits than its factorization.

56157820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 502 (or 500 counting only the distinct ones).

The product of its (nonzero) digits is 16800, while the sum is 34.

The square root of 56157820 is about 7493.8521469268. The cubic root of 56157820 is about 382.9453027894.

The spelling of 56157820 in words is "fifty-six million, one hundred fifty-seven thousand, eight hundred twenty".