57217216 has 28 divisors (see below), whose sum is σ = 129761488. Its totient is φ = 24521472.

The previous prime is 57217213. The next prime is 57217231. The reversal of 57217216 is 61271275.

It is a tau number, because it is divible by the number of its divisors (28).

It is not an unprimeable number, because it can be changed into a prime (57217213) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63411 + ... + 64306.

Almost surely, 2^57217216 is an apocalyptic number.

57217216 is a gapful number since it is divisible by the number (56) formed by its first and last digit.

It is an amenable number.

57217216 is an abundant number, since it is smaller than the sum of its proper divisors (72544272).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

57217216 is a wasteful number, since it uses less digits than its factorization.

57217216 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127736 (or 127726 counting only the distinct ones).

The product of its digits is 5880, while the sum is 31.

The square root of 57217216 is about 7564.2062372730. The cubic root of 57217216 is about 385.3383566219.

The spelling of 57217216 in words is "fifty-seven million, two hundred seventeen thousand, two hundred sixteen".