56857216 has 64 divisors (see below), whose sum is σ = 124750080. Its totient is φ = 25648128.

The previous prime is 56857189. The next prime is 56857217. The reversal of 56857216 is 61275865.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×56857216² = 6465486022541312, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (56857217) 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, 77845 + ... + 78571.

It is an arithmetic number, because the mean of its divisors is an integer number (1949220).

Almost surely, 2^56857216 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 56857216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (62375040).

56857216 is an abundant number, since it is smaller than the sum of its proper divisors (67892864).

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

56857216 is a wasteful number, since it uses less digits than its factorization.

56857216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 801 (or 789 counting only the distinct ones).

The product of its digits is 100800, while the sum is 40.

The square root of 56857216 is about 7540.3724045965. The cubic root of 56857216 is about 384.5284968364.

The spelling of 56857216 in words is "fifty-six million, eight hundred fifty-seven thousand, two hundred sixteen".