557981568 has 64 divisors (see below), whose sum is σ = 1646830800. Its totient is φ = 185992704.

The previous prime is 557981537. The next prime is 557981581. The reversal of 557981568 is 865189755.

557981568 is a `hidden beast` number, since 5 + 5 + 79 + 8 + 1 + 568 = 666.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×557981568² = 622686860455477248, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77271 + ... + 84182.

Almost surely, 2^557981568 is an apocalyptic number.

It is an amenable number.

557981568 is an abundant number, since it is smaller than the sum of its proper divisors (1088849232).

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

557981568 is a wasteful number, since it uses less digits than its factorization.

557981568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 161476 (or 161458 counting only the distinct ones).

The product of its digits is 3024000, while the sum is 54.

The square root of 557981568 is about 23621.6334744234. The cubic root of 557981568 is about 823.2655660957.

The spelling of 557981568 in words is "five hundred fifty-seven million, nine hundred eighty-one thousand, five hundred sixty-eight".