57172557 has 8 divisors (see below), whose sum is σ = 82093984. Its totient is φ = 35183088.

The previous prime is 57172483. The next prime is 57172559. The reversal of 57172557 is 75527175.

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

It is not a de Polignac number, because 57172557 - 2⁸ = 57172301 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (39), and also a Moran number because the ratio is a prime number: 1465963 = 57172557 / (5 + 7 + 1 + 7 + 2 + 5 + 5 + 7).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57172559) 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, 732943 + ... + 733020.

It is an arithmetic number, because the mean of its divisors is an integer number (10261748).

Almost surely, 2^57172557 is an apocalyptic number.

It is an amenable number.

57172557 is a deficient number, since it is larger than the sum of its proper divisors (24921427).

57172557 is a wasteful number, since it uses less digits than its factorization.

57172557 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1465979.

The product of its digits is 85750, while the sum is 39.

The square root of 57172557 is about 7561.2536658943. The cubic root of 57172557 is about 385.2380761698.

The spelling of 57172557 in words is "fifty-seven million, one hundred seventy-two thousand, five hundred fifty-seven".