57251520 has 168 divisors, whose sum is σ = 199863456. Its totient is φ = 15040512.

The previous prime is 57251507. The next prime is 57251521. The reversal of 57251520 is 2515275.

It is a happy number.

It is a hoax number, since the sum of its digits (27) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (57251521) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 296544 + ... + 296736.

Almost surely, 2^57251520 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 57251520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99931728).

57251520 is an abundant number, since it is smaller than the sum of its proper divisors (142611936).

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

57251520 is a wasteful number, since it uses less digits than its factorization.

57251520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 319 (or 306 counting only the distinct ones).

The product of its (nonzero) digits is 3500, while the sum is 27.

The square root of 57251520 is about 7566.4734189714. The cubic root of 57251520 is about 385.4153498015.

Adding to 57251520 its reverse (2515275), we get a palindrome (59766795).

The spelling of 57251520 in words is "fifty-seven million, two hundred fifty-one thousand, five hundred twenty".