56685021 has 16 divisors (see below), whose sum is σ = 80232768. Its totient is φ = 35475200.

The previous prime is 56684911. The next prime is 56685029. The reversal of 56685021 is 12058665.

It is a cyclic number.

It is not a de Polignac number, because 56685021 - 2⁷ = 56684893 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56685029) 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, 22306 + ... + 24716.

It is an arithmetic number, because the mean of its divisors is an integer number (5014548).

Almost surely, 2^56685021 is an apocalyptic number.

56685021 is a gapful number since it is divisible by the number (51) formed by its first and last digit.

It is an amenable number.

56685021 is a deficient number, since it is larger than the sum of its proper divisors (23547747).

56685021 is a wasteful number, since it uses less digits than its factorization.

56685021 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2892.

The product of its (nonzero) digits is 14400, while the sum is 33.

The square root of 56685021 is about 7528.9455437000. The cubic root of 56685021 is about 384.1399161899.

The spelling of 56685021 in words is "fifty-six million, six hundred eighty-five thousand, twenty-one".