57721064 has 8 divisors (see below), whose sum is σ = 108227010. Its totient is φ = 28860528.

The previous prime is 57721063. The next prime is 57721087. The reversal of 57721064 is 46012775.

It can be written as a sum of positive squares in only one way, i.e., 47748100 + 9972964 = 6910^2 + 3158^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a self number, because there is not a number n which added to its sum of digits gives 57721064.

It is not an unprimeable number, because it can be changed into a prime (57721061) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3607559 + ... + 3607574.

Almost surely, 2^57721064 is an apocalyptic number.

It is an amenable number.

57721064 is a deficient number, since it is larger than the sum of its proper divisors (50505946).

57721064 is a wasteful number, since it uses less digits than its factorization.

57721064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7215139 (or 7215135 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 32.

The square root of 57721064 is about 7597.4379892172. The cubic root of 57721064 is about 386.4661339621.

The spelling of 57721064 in words is "fifty-seven million, seven hundred twenty-one thousand, sixty-four".