57721061376 has 384 divisors, whose sum is σ = 188929540800. Its totient is φ = 17464688640.

The previous prime is 57721061371. The next prime is 57721061399. The reversal of 57721061376 is 67316012775.

57721061376 is a `hidden beast` number, since 5 + 7 + 7 + 21 + 0 + 613 + 7 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (384).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57721061371) 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 in 23 ways as a sum of consecutive naturals, for example, 87588535 + ... + 87589193.

Almost surely, 2^57721061376 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57721061376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94464770400).

57721061376 is an abundant number, since it is smaller than the sum of its proper divisors (131208479424).

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

57721061376 is an frugal number, since it uses more digits than its factorization.

57721061376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 715 (or 675 counting only the distinct ones).

The product of its (nonzero) digits is 370440, while the sum is 45.

The spelling of 57721061376 in words is "fifty-seven billion, seven hundred twenty-one million, sixty-one thousand, three hundred seventy-six".