57721887 has 24 divisors (see below), whose sum is σ = 86560656. Its totient is φ = 37034496.

The previous prime is 57721877. The next prime is 57721889. The reversal of 57721887 is 78812775.

57721887 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 57721887 - 2⁷ = 57721759 is a prime.

It is a super-3 number, since 3×57721887³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57721889) 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 23 ways as a sum of consecutive naturals, for example, 31408 + ... + 33194.

It is an arithmetic number, because the mean of its divisors is an integer number (3606694).

Almost surely, 2^57721887 is an apocalyptic number.

57721887 is a deficient number, since it is larger than the sum of its proper divisors (28838769).

57721887 is a wasteful number, since it uses less digits than its factorization.

57721887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1927 (or 1924 counting only the distinct ones).

The product of its digits is 219520, while the sum is 45.

The square root of 57721887 is about 7597.4921520196. The cubic root of 57721887 is about 386.4679707273.

The spelling of 57721887 in words is "fifty-seven million, seven hundred twenty-one thousand, eight hundred eighty-seven".