57272320 has 192 divisors, whose sum is σ = 169827840. Its totient is φ = 18087936.

The previous prime is 57272317. The next prime is 57272321. The reversal of 57272320 is 2327275.

It is a Harshad number since it is a multiple of its sum of digits (28).

It is not an unprimeable number, because it can be changed into a prime (57272321) 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, 1218537 + ... + 1218583.

It is an arithmetic number, because the mean of its divisors is an integer number (884520).

Almost surely, 2^57272320 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 57272320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (84913920).

57272320 is an abundant number, since it is smaller than the sum of its proper divisors (112555520).

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

57272320 is a wasteful number, since it uses less digits than its factorization.

57272320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98 (or 78 counting only the distinct ones).

The product of its (nonzero) digits is 5880, while the sum is 28.

The square root of 57272320 is about 7567.8477785960. The cubic root of 57272320 is about 385.4620191222.

Adding to 57272320 its reverse (2327275), we get a palindrome (59599595).

The spelling of 57272320 in words is "fifty-seven million, two hundred seventy-two thousand, three hundred twenty".