57381318 has 32 divisors (see below), whose sum is σ = 128718720. Its totient is φ = 18946440.

The previous prime is 57381299. The next prime is 57381319. The reversal of 57381318 is 81318375.

57381318 is a `hidden beast` number, since 573 + 81 + 3 + 1 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57381319) 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, 813 + ... + 10743.

It is an arithmetic number, because the mean of its divisors is an integer number (4022460).

Almost surely, 2^57381318 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 57381318, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (64359360).

57381318 is an abundant number, since it is smaller than the sum of its proper divisors (71337402).

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

57381318 is a wasteful number, since it uses less digits than its factorization.

57381318 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10049 (or 10043 counting only the distinct ones).

The product of its digits is 20160, while the sum is 36.

The square root of 57381318 is about 7575.0457424361. The cubic root of 57381318 is about 385.7063952530.

It can be divided in two parts, 5738 and 1318, that added together give a square (7056 = 84²).

The spelling of 57381318 in words is "fifty-seven million, three hundred eighty-one thousand, three hundred eighteen".