557730720 has 72 divisors (see below), whose sum is σ = 1903260996. Its totient is φ = 148727808.

The previous prime is 557730709. The next prime is 557730727. The reversal of 557730720 is 27037755.

557730720 is a `hidden beast` number, since 557 + 7 + 30 + 72 + 0 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 546998544 + 10732176 = 23388^2 + 3276^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a super-2 number, since 2×557730720² = 622127112063436800, which contains 22 as substring.

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

It is not an unprimeable number, because it can be changed into a prime (557730727) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 192217 + ... + 195096.

Almost surely, 2^557730720 is an apocalyptic number.

It is an amenable number.

557730720 is an abundant number, since it is smaller than the sum of its proper divisors (1345530276).

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

557730720 is a wasteful number, since it uses less digits than its factorization.

557730720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 387334 (or 387323 counting only the distinct ones).

The product of its (nonzero) digits is 51450, while the sum is 36.

The square root of 557730720 is about 23616.3231685205. The cubic root of 557730720 is about 823.1421776259.

The spelling of 557730720 in words is "five hundred fifty-seven million, seven hundred thirty thousand, seven hundred twenty".