57397728 has 96 divisors (see below), whose sum is σ = 159213600. Its totient is φ = 18077696.

The previous prime is 57397633. The next prime is 57397759. The reversal of 57397728 is 82779375.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 147358 + ... + 147746.

It is an arithmetic number, because the mean of its divisors is an integer number (1658475).

Almost surely, 2^57397728 is an apocalyptic number.

57397728 is a gapful number since it is divisible by the number (58) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57397728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79606800).

57397728 is an abundant number, since it is smaller than the sum of its proper divisors (101815872).

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

57397728 is a wasteful number, since it uses less digits than its factorization.

57397728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 484 (or 476 counting only the distinct ones).

The product of its digits is 740880, while the sum is 48.

The square root of 57397728 is about 7576.1288267822. The cubic root of 57397728 is about 385.7431600567.

The spelling of 57397728 in words is "fifty-seven million, three hundred ninety-seven thousand, seven hundred twenty-eight".