57222720 has 224 divisors, whose sum is σ = 208483200. Its totient is φ = 14764032.

The previous prime is 57222709. The next prime is 57222733. The reversal of 57222720 is 2722275.

It is a happy number.

57222720 is a `hidden beast` number, since 572 + 22 + 72 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (27).

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, 319591 + ... + 319769.

Almost surely, 2^57222720 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 57222720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (104241600).

57222720 is an abundant number, since it is smaller than the sum of its proper divisors (151260480).

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

57222720 is a wasteful number, since it uses less digits than its factorization.

57222720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 242 (or 226 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 27.

The square root of 57222720 is about 7564.5700472664. The cubic root of 57222720 is about 385.3507120775.

Adding to 57222720 its reverse (2722275), we get a palindrome (59944995).

The spelling of 57222720 in words is "fifty-seven million, two hundred twenty-two thousand, seven hundred twenty".