57312738 has 128 divisors (see below), whose sum is σ = 154583040. Its totient is φ = 15396480.

The previous prime is 57312737. The next prime is 57312743. The reversal of 57312738 is 83721375.

57312738 is a `hidden beast` number, since 573 + 12 + 73 + 8 = 666.

57312738 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (57312737) 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 63 ways as a sum of consecutive naturals, for example, 785070 + ... + 785142.

It is an arithmetic number, because the mean of its divisors is an integer number (1207680).

Almost surely, 2^57312738 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57312738, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (77291520).

57312738 is an abundant number, since it is smaller than the sum of its proper divisors (97270302).

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

57312738 is a wasteful number, since it uses less digits than its factorization.

57312738 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 189 (or 183 counting only the distinct ones).

The product of its digits is 35280, while the sum is 36.

The square root of 57312738 is about 7570.5176837519. The cubic root of 57312738 is about 385.5526733882.

The spelling of 57312738 in words is "fifty-seven million, three hundred twelve thousand, seven hundred thirty-eight".