56722891 has 4 divisors (see below), whose sum is σ = 58042072. Its totient is φ = 55403712.

The previous prime is 56722877. The next prime is 56722903. The reversal of 56722891 is 19822765.

56722891 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 56722891 - 2¹¹ = 56720843 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (56722871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 659526 + ... + 659611.

It is an arithmetic number, because the mean of its divisors is an integer number (14510518).

Almost surely, 2^56722891 is an apocalyptic number.

56722891 is a deficient number, since it is larger than the sum of its proper divisors (1319181).

56722891 is a wasteful number, since it uses less digits than its factorization.

56722891 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1319180.

The product of its digits is 60480, while the sum is 40.

The square root of 56722891 is about 7531.4600842068. The cubic root of 56722891 is about 384.2254422541.

The spelling of 56722891 in words is "fifty-six million, seven hundred twenty-two thousand, eight hundred ninety-one".