57776721 has 16 divisors (see below), whose sum is σ = 79500864. Its totient is φ = 37295424.

The previous prime is 57776711. The next prime is 57776743. The reversal of 57776721 is 12767775.

It is a happy number.

57776721 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 57776721 - 2⁵ = 57776689 is a prime.

It is not an unprimeable number, because it can be changed into a prime (57776711) 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 15 ways as a sum of consecutive naturals, for example, 24051 + ... + 26343.

It is an arithmetic number, because the mean of its divisors is an integer number (4968804).

Almost surely, 2^57776721 is an apocalyptic number.

It is an amenable number.

57776721 is a deficient number, since it is larger than the sum of its proper divisors (21724143).

57776721 is a wasteful number, since it uses less digits than its factorization.

57776721 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2560.

The product of its digits is 144060, while the sum is 42.

The square root of 57776721 is about 7601.0999861862. The cubic root of 57776721 is about 386.5903095194.

The spelling of 57776721 in words is "fifty-seven million, seven hundred seventy-six thousand, seven hundred twenty-one".