57216855 has 32 divisors (see below), whose sum is σ = 97781760. Its totient is φ = 28506240.

The previous prime is 57216851. The next prime is 57216869. The reversal of 57216855 is 55861275.

It is not a de Polignac number, because 57216855 - 2² = 57216851 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57216851) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 11364 + ... + 15606.

It is an arithmetic number, because the mean of its divisors is an integer number (3055680).

Almost surely, 2^57216855 is an apocalyptic number.

57216855 is a deficient number, since it is larger than the sum of its proper divisors (40564905).

57216855 is a wasteful number, since it uses less digits than its factorization.

57216855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4311.

The product of its digits is 84000, while the sum is 39.

The square root of 57216855 is about 7564.1823748506. The cubic root of 57216855 is about 385.3375462164.

The spelling of 57216855 in words is "fifty-seven million, two hundred sixteen thousand, eight hundred fifty-five".