56821980 has 24 divisors (see below), whose sum is σ = 159101712. Its totient is φ = 15152512.

The previous prime is 56821931. The next prime is 56821981. The reversal of 56821980 is 8912865.

It is a super-2 number, since 2×56821980² = 6457474822240800, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56821981) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 473457 + ... + 473576.

It is an arithmetic number, because the mean of its divisors is an integer number (6629238).

Almost surely, 2^56821980 is an apocalyptic number.

It is an amenable number.

56821980 is an abundant number, since it is smaller than the sum of its proper divisors (102279732).

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

56821980 is a wasteful number, since it uses less digits than its factorization.

56821980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 947045 (or 947043 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 39.

The square root of 56821980 is about 7538.0355531133. The cubic root of 56821980 is about 384.4490460825.

The spelling of 56821980 in words is "fifty-six million, eight hundred twenty-one thousand, nine hundred eighty".