56981820 has 48 divisors (see below), whose sum is σ = 182343168. Its totient is φ = 13024320.

The previous prime is 56981791. The next prime is 56981849. The reversal of 56981820 is 2818965.

It is an interprime number because it is at equal distance from previous prime (56981791) and next prime (56981849).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 67416 + ... + 68255.

It is an arithmetic number, because the mean of its divisors is an integer number (3798816).

Almost surely, 2^56981820 is an apocalyptic number.

It is an amenable number.

56981820 is an abundant number, since it is smaller than the sum of its proper divisors (125361348).

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

56981820 is a wasteful number, since it uses less digits than its factorization.

56981820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135690 (or 135688 counting only the distinct ones).

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

The square root of 56981820 is about 7548.6303393397. The cubic root of 56981820 is about 384.8091931333.

The spelling of 56981820 in words is "fifty-six million, nine hundred eighty-one thousand, eight hundred twenty".