56081556 has 36 divisors (see below), whose sum is σ = 142064832. Its totient is φ = 18653904.

The previous prime is 56081539. The next prime is 56081569. The reversal of 56081556 is 65518065.

It is a tau number, because it is divible by the number of its divisors (36).

It is a super-2 number, since 2×56081556² = 6290281846762272, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 56081556.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 18885 + ... + 21651.

Almost surely, 2^56081556 is an apocalyptic number.

It is an amenable number.

56081556 is an abundant number, since it is smaller than the sum of its proper divisors (85983276).

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

56081556 is a wasteful number, since it uses less digits than its factorization.

56081556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3340 (or 3335 counting only the distinct ones).

The product of its (nonzero) digits is 36000, while the sum is 36.

The square root of 56081556 is about 7488.7619804611. The cubic root of 56081556 is about 382.7718738650.

The spelling of 56081556 in words is "fifty-six million, eighty-one thousand, five hundred fifty-six".