557531640 has 64 divisors (see below), whose sum is σ = 1858442400. Its totient is φ = 148674816.

The previous prime is 557531633. The next prime is 557531647. The reversal of 557531640 is 46135755.

557531640 is a `hidden beast` number, since 5 + 5 + 7 + 5 + 3 + 1 + 640 = 666.

It is an interprime number because it is at equal distance from previous prime (557531633) and next prime (557531647).

It is a super-3 number, since 3×557531640³ (a number of 27 digits) contains 333 as substring.

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

It is a junction number, because it is equal to n+sod(n) for n = 557531595 and 557531604.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557531647) 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, 257037 + ... + 259196.

Almost surely, 2^557531640 is an apocalyptic number.

It is an amenable number.

557531640 is an abundant number, since it is smaller than the sum of its proper divisors (1300910760).

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

557531640 is a wasteful number, since it uses less digits than its factorization.

557531640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 516253 (or 516243 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 36.

The square root of 557531640 is about 23612.1079109850. The cubic root of 557531640 is about 823.0442267448.

The spelling of 557531640 in words is "five hundred fifty-seven million, five hundred thirty-one thousand, six hundred forty".