56861556 has 12 divisors (see below), whose sum is σ = 132676992. Its totient is φ = 18953848.

The previous prime is 56861551. The next prime is 56861569. The reversal of 56861556 is 65516865.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×56861556² = 6466473101482272, which contains 22 as substring.

It is a Smith number, since the sum of its digits (42) 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 (56861551) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2369220 + ... + 2369243.

It is an arithmetic number, because the mean of its divisors is an integer number (11056416).

Almost surely, 2^56861556 is an apocalyptic number.

It is an amenable number.

56861556 is an abundant number, since it is smaller than the sum of its proper divisors (75815436).

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

56861556 is a wasteful number, since it uses less digits than its factorization.

56861556 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4738470 (or 4738468 counting only the distinct ones).

The product of its digits is 216000, while the sum is 42.

The square root of 56861556 is about 7540.6601832996. The cubic root of 56861556 is about 384.5382804742.

The spelling of 56861556 in words is "fifty-six million, eight hundred sixty-one thousand, five hundred fifty-six".