56752721 has 4 divisors (see below), whose sum is σ = 56793600. Its totient is φ = 56711844.

The previous prime is 56752711. The next prime is 56752741. The reversal of 56752721 is 12725765.

It is a happy number.

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 56752721 - 2²² = 52558417 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (56752711) 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, 18281 + ... + 21158.

It is an arithmetic number, because the mean of its divisors is an integer number (14198400).

Almost surely, 2^56752721 is an apocalyptic number.

It is an amenable number.

56752721 is a deficient number, since it is larger than the sum of its proper divisors (40879).

56752721 is a wasteful number, since it uses less digits than its factorization.

56752721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40878.

The product of its digits is 29400, while the sum is 35.

The square root of 56752721 is about 7533.4401836080. The cubic root of 56752721 is about 384.2927838874.

The spelling of 56752721 in words is "fifty-six million, seven hundred fifty-two thousand, seven hundred twenty-one".