57031287 has 24 divisors (see below), whose sum is σ = 80057472. Its totient is φ = 36093120.

The previous prime is 57031259. The next prime is 57031291. The reversal of 57031287 is 78213075.

It is not a de Polignac number, because 57031287 - 2¹⁰ = 57030263 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57035287) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 216718 + ... + 216980.

It is an arithmetic number, because the mean of its divisors is an integer number (3335728).

Almost surely, 2^57031287 is an apocalyptic number.

57031287 is a deficient number, since it is larger than the sum of its proper divisors (23026185).

57031287 is a wasteful number, since it uses less digits than its factorization.

57031287 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 391 (or 350 counting only the distinct ones).

The product of its (nonzero) digits is 11760, while the sum is 33.

The square root of 57031287 is about 7551.9061832096. The cubic root of 57031287 is about 384.9205143155.

The spelling of 57031287 in words is "fifty-seven million, thirty-one thousand, two hundred eighty-seven".