56687687 has 16 divisors (see below), whose sum is σ = 67433472. Its totient is φ = 46644000.

The previous prime is 56687681. The next prime is 56687699. The reversal of 56687687 is 78678665.

It is a cyclic number.

It is not a de Polignac number, because 56687687 - 2⁴ = 56687671 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (53).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56687681) 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, 15812 + ... + 19062.

It is an arithmetic number, because the mean of its divisors is an integer number (4214592).

Almost surely, 2^56687687 is an apocalyptic number.

56687687 is a deficient number, since it is larger than the sum of its proper divisors (10745785).

56687687 is a wasteful number, since it uses less digits than its factorization.

56687687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3358.

The product of its digits is 3386880, while the sum is 53.

The square root of 56687687 is about 7529.1225916437. The cubic root of 56687687 is about 384.1459383626.

The spelling of 56687687 in words is "fifty-six million, six hundred eighty-seven thousand, six hundred eighty-seven".