56406621 has 4 divisors (see below), whose sum is σ = 75208832. Its totient is φ = 37604412.

The previous prime is 56406613. The next prime is 56406641. The reversal of 56406621 is 12660465.

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 not a de Polignac number, because 56406621 - 2³ = 56406613 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 (56406641) 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, 9401101 + ... + 9401106.

It is an arithmetic number, because the mean of its divisors is an integer number (18802208).

Almost surely, 2^56406621 is an apocalyptic number.

It is an amenable number.

56406621 is a deficient number, since it is larger than the sum of its proper divisors (18802211).

56406621 is a wasteful number, since it uses less digits than its factorization.

56406621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18802210.

The product of its (nonzero) digits is 8640, while the sum is 30.

The square root of 56406621 is about 7510.4341419122. The cubic root of 56406621 is about 383.5100019093.

The spelling of 56406621 in words is "fifty-six million, four hundred six thousand, six hundred twenty-one".