57721940 has 24 divisors (see below), whose sum is σ = 121833600. Its totient is φ = 22971168.

The previous prime is 57721933. The next prime is 57721949. The reversal of 57721940 is 4912775.

It is a self number, because there is not a number n which added to its sum of digits gives 57721940.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57721949) 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 7 ways as a sum of consecutive naturals, for example, 3272 + ... + 11231.

It is an arithmetic number, because the mean of its divisors is an integer number (5076400).

Almost surely, 2^57721940 is an apocalyptic number.

It is an amenable number.

57721940 is an abundant number, since it is smaller than the sum of its proper divisors (64111660).

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

57721940 is a wasteful number, since it uses less digits than its factorization.

57721940 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14711 (or 14709 counting only the distinct ones).

The product of its (nonzero) digits is 17640, while the sum is 35.

The square root of 57721940 is about 7597.4956400119. The cubic root of 57721940 is about 386.4680890117.

The spelling of 57721940 in words is "fifty-seven million, seven hundred twenty-one thousand, nine hundred forty".