557021808 has 180 divisors, whose sum is σ = 1835842320. Its totient is φ = 157183488.

The previous prime is 557021783. The next prime is 557021819. The reversal of 557021808 is 808120755.

557021808 is a `hidden beast` number, since 5 + 570 + 2 + 1 + 80 + 8 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 627541 + ... + 628427.

It is an arithmetic number, because the mean of its divisors is an integer number (10199124).

Almost surely, 2^557021808 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 557021808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (917921160).

557021808 is an abundant number, since it is smaller than the sum of its proper divisors (1278820512).

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

557021808 is a wasteful number, since it uses less digits than its factorization.

557021808 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1004 (or 988 counting only the distinct ones).

The product of its (nonzero) digits is 22400, while the sum is 36.

The square root of 557021808 is about 23601.3094551976. The cubic root of 557021808 is about 822.7932740193.

The spelling of 557021808 in words is "five hundred fifty-seven million, twenty-one thousand, eight hundred eight".