56647421 has 4 divisors (see below), whose sum is σ = 57445344. Its totient is φ = 55849500.

The previous prime is 56647397. The next prime is 56647427. The reversal of 56647421 is 12474665.

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 a de Polignac number, because none of the positive numbers 2^k-56647421 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 (56647427) 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, 398855 + ... + 398996.

It is an arithmetic number, because the mean of its divisors is an integer number (14361336).

Almost surely, 2^56647421 is an apocalyptic number.

It is an amenable number.

56647421 is a deficient number, since it is larger than the sum of its proper divisors (797923).

56647421 is an equidigital number, since it uses as much as digits as its factorization.

56647421 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 797922.

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

The square root of 56647421 is about 7526.4480998676. The cubic root of 56647421 is about 384.0549622030.

The spelling of 56647421 in words is "fifty-six million, six hundred forty-seven thousand, four hundred twenty-one".