56664687 has 8 divisors (see below), whose sum is σ = 75770800. Its totient is φ = 37667520.

The previous prime is 56664679. The next prime is 56664697. The reversal of 56664687 is 78646665.

56664687 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 56664687 - 2³ = 56664679 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56664667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 26014 + ... + 28107.

It is an arithmetic number, because the mean of its divisors is an integer number (9471350).

Almost surely, 2^56664687 is an apocalyptic number.

56664687 is a deficient number, since it is larger than the sum of its proper divisors (19106113).

56664687 is a wasteful number, since it uses less digits than its factorization.

56664687 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54473.

The product of its digits is 1451520, while the sum is 48.

The square root of 56664687 is about 7527.5950342722. The cubic root of 56664687 is about 384.0939779208.

The spelling of 56664687 in words is "fifty-six million, six hundred sixty-four thousand, six hundred eighty-seven".