57117280 has 192 divisors, whose sum is σ = 164602368. Its totient is φ = 18472960.

The previous prime is 57117227. The next prime is 57117293. The reversal of 57117280 is 8271175.

It is a happy number.

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, 688119 + ... + 688201.

It is an arithmetic number, because the mean of its divisors is an integer number (857304).

Almost surely, 2^57117280 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 57117280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (82301184).

57117280 is an abundant number, since it is smaller than the sum of its proper divisors (107485088).

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

57117280 is a wasteful number, since it uses less digits than its factorization.

57117280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 149 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 3920, while the sum is 31.

The square root of 57117280 is about 7557.5975018520. The cubic root of 57117280 is about 385.1138809681.

The spelling of 57117280 in words is "fifty-seven million, one hundred seventeen thousand, two hundred eighty".