57261287 has 8 divisors (see below), whose sum is σ = 61484832. Its totient is φ = 53132800.

The previous prime is 57261241. The next prime is 57261289. The reversal of 57261287 is 78216275.

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

It is a cyclic number.

It is not a de Polignac number, because 57261287 - 2⁸ = 57261031 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 57261287.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57261289) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22514 + ... + 24927.

It is an arithmetic number, because the mean of its divisors is an integer number (7685604).

Almost surely, 2^57261287 is an apocalyptic number.

57261287 is a deficient number, since it is larger than the sum of its proper divisors (4223545).

57261287 is a wasteful number, since it uses less digits than its factorization.

57261287 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47529.

The product of its digits is 47040, while the sum is 38.

The square root of 57261287 is about 7567.1188044063. The cubic root of 57261287 is about 385.4372655962.

The spelling of 57261287 in words is "fifty-seven million, two hundred sixty-one thousand, two hundred eighty-seven".