57306228 has 96 divisors (see below), whose sum is σ = 160849920. Its totient is φ = 15534720.

The previous prime is 57306209. The next prime is 57306247. The reversal of 57306228 is 82260375.

It is an interprime number because it is at equal distance from previous prime (57306209) and next prime (57306247).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 153450 + ... + 153822.

It is an arithmetic number, because the mean of its divisors is an integer number (1675520).

Almost surely, 2^57306228 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 57306228, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (80424960).

57306228 is an abundant number, since it is smaller than the sum of its proper divisors (103543692).

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

57306228 is a wasteful number, since it uses less digits than its factorization.

57306228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 477 (or 475 counting only the distinct ones).

The product of its (nonzero) digits is 20160, while the sum is 33.

The square root of 57306228 is about 7570.0877141550. The cubic root of 57306228 is about 385.5380748712.

The spelling of 57306228 in words is "fifty-seven million, three hundred six thousand, two hundred twenty-eight".