57220688 has 80 divisors (see below), whose sum is σ = 134158080. Its totient is φ = 23113728.

The previous prime is 57220687. The next prime is 57220693. The reversal of 57220688 is 88602275.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57220687) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 249758 + ... + 249986.

It is an arithmetic number, because the mean of its divisors is an integer number (1676976).

Almost surely, 2^57220688 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 57220688, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (67079040).

57220688 is an abundant number, since it is smaller than the sum of its proper divisors (76937392).

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

57220688 is a wasteful number, since it uses less digits than its factorization.

57220688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364 (or 358 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 38.

The square root of 57220688 is about 7564.4357357307. The cubic root of 57220688 is about 385.3461507080.

The spelling of 57220688 in words is "fifty-seven million, two hundred twenty thousand, six hundred eighty-eight".