56628681 has 4 divisors (see below), whose sum is σ = 75504912. Its totient is φ = 37752452.

The previous prime is 56628673. The next prime is 56628703. The reversal of 56628681 is 18682665.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 56628681 - 2³ = 56628673 is a prime.

It is a super-2 number, since 2×56628681² = 6413615023599522, which contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56628631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 9438111 + ... + 9438116.

It is an arithmetic number, because the mean of its divisors is an integer number (18876228).

Almost surely, 2^56628681 is an apocalyptic number.

It is an amenable number.

56628681 is a deficient number, since it is larger than the sum of its proper divisors (18876231).

56628681 is a wasteful number, since it uses less digits than its factorization.

56628681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18876230.

The product of its digits is 138240, while the sum is 42.

The square root of 56628681 is about 7525.2030537388. The cubic root of 56628681 is about 384.0126067367.

The spelling of 56628681 in words is "fifty-six million, six hundred twenty-eight thousand, six hundred eighty-one".