57136721724 has 72 divisors (see below), whose sum is σ = 144882388560. Its totient is φ = 18985881600.

The previous prime is 57136721699. The next prime is 57136721737. The reversal of 57136721724 is 42712763175.

57136721724 is a `hidden beast` number, since 5 + 71 + 367 + 217 + 2 + 4 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 57136721724.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 21246972 + ... + 21249660.

Almost surely, 2^57136721724 is an apocalyptic number.

It is an amenable number.

57136721724 is an abundant number, since it is smaller than the sum of its proper divisors (87745666836).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57136721724 is a wasteful number, since it uses less digits than its factorization.

57136721724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4331 (or 4326 counting only the distinct ones).

The product of its digits is 493920, while the sum is 45.

The spelling of 57136721724 in words is "fifty-seven billion, one hundred thirty-six million, seven hundred twenty-one thousand, seven hundred twenty-four".