57128331 has 8 divisors (see below), whose sum is σ = 82030480. Its totient is φ = 35155872.

The previous prime is 57128311. The next prime is 57128339. The reversal of 57128331 is 13382175.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 57128331 - 2¹⁰ = 57127307 is a prime.

It is a super-2 number, since 2×57128331² = 6527292405691122, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57128339) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 732376 + ... + 732453.

It is an arithmetic number, because the mean of its divisors is an integer number (10253810).

Almost surely, 2^57128331 is an apocalyptic number.

57128331 is a deficient number, since it is larger than the sum of its proper divisors (24902149).

57128331 is a wasteful number, since it uses less digits than its factorization.

57128331 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1464845.

The product of its digits is 5040, while the sum is 30.

The square root of 57128331 is about 7558.3285850775. The cubic root of 57128331 is about 385.1387165289.

The spelling of 57128331 in words is "fifty-seven million, one hundred twenty-eight thousand, three hundred thirty-one".