56464721 has 4 divisors (see below), whose sum is σ = 56487744. Its totient is φ = 56441700.

The previous prime is 56464717. The next prime is 56464729. The reversal of 56464721 is 12746465.

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, and also an emirpimes, since its reverse is a distinct semiprime: 12746465 = 5 ⋅2549293.

It is a cyclic number.

It is not a de Polignac number, because 56464721 - 2² = 56464717 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56464729) 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, 7325 + ... + 12906.

It is an arithmetic number, because the mean of its divisors is an integer number (14121936).

Almost surely, 2^56464721 is an apocalyptic number.

It is an amenable number.

56464721 is a deficient number, since it is larger than the sum of its proper divisors (23023).

56464721 is a wasteful number, since it uses less digits than its factorization.

56464721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 23022.

The product of its digits is 40320, while the sum is 35.

The square root of 56464721 is about 7514.3010985720. The cubic root of 56464721 is about 383.6416311684.

The spelling of 56464721 in words is "fifty-six million, four hundred sixty-four thousand, seven hundred twenty-one".