56173687 has 4 divisors (see below), whose sum is σ = 56190040. Its totient is φ = 56157336.

The previous prime is 56173669. The next prime is 56173703. The reversal of 56173687 is 78637165.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-56173687 is a prime.

It is a super-2 number, since 2×56173687² = 6310966222347938, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56173657) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 813 + ... + 10630.

It is an arithmetic number, because the mean of its divisors is an integer number (14047510).

Almost surely, 2^56173687 is an apocalyptic number.

56173687 is a deficient number, since it is larger than the sum of its proper divisors (16353).

56173687 is a wasteful number, since it uses less digits than its factorization.

56173687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16352.

The product of its digits is 211680, while the sum is 43.

The square root of 56173687 is about 7494.9107399622. The cubic root of 56173687 is about 382.9813655671.

The spelling of 56173687 in words is "fifty-six million, one hundred seventy-three thousand, six hundred eighty-seven".