56687621 has 4 divisors (see below), whose sum is σ = 59671200. Its totient is φ = 53704044.

The previous prime is 56687611. The next prime is 56687629. The reversal of 56687621 is 12678665.

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 56687621 - 2⁶ = 56687557 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56687629) 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, 1491761 + ... + 1491798.

It is an arithmetic number, because the mean of its divisors is an integer number (14917800).

Almost surely, 2^56687621 is an apocalyptic number.

It is an amenable number.

56687621 is a deficient number, since it is larger than the sum of its proper divisors (2983579).

56687621 is a wasteful number, since it uses less digits than its factorization.

56687621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2983578.

The product of its digits is 120960, while the sum is 41.

The square root of 56687621 is about 7529.1182086616. The cubic root of 56687621 is about 384.1457892788.

The spelling of 56687621 in words is "fifty-six million, six hundred eighty-seven thousand, six hundred twenty-one".