56403621 has 20 divisors (see below), whose sum is σ = 84936192. Its totient is φ = 37299528.

The previous prime is 56403593. The next prime is 56403623. The reversal of 56403621 is 12630465.

It is not a de Polignac number, because 56403621 - 2¹⁰ = 56402597 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (56403623) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 7546 + ... + 13028.

Almost surely, 2^56403621 is an apocalyptic number.

It is an amenable number.

56403621 is a deficient number, since it is larger than the sum of its proper divisors (28532571).

56403621 is a wasteful number, since it uses less digits than its factorization.

56403621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5622 (or 5613 counting only the distinct ones).

The product of its (nonzero) digits is 4320, while the sum is 27.

The square root of 56403621 is about 7510.2344171138. The cubic root of 56403621 is about 383.5032027642.

It can be divided in two parts, 5640 and 3621, that added together give a cube (9261 = 21³).

The spelling of 56403621 in words is "fifty-six million, four hundred three thousand, six hundred twenty-one".