557731440 has 160 divisors (see below), whose sum is σ = 2195573760. Its totient is φ = 127478016.

The previous prime is 557731423. The next prime is 557731441. The reversal of 557731440 is 44137755.

It is a happy number.

It is a super-2 number, since 2×557731440² = 622128718328947200, which contains 22 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 = 557731395 and 557731404.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (557731441) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 3324 + ... + 33563.

It is an arithmetic number, because the mean of its divisors is an integer number (13722336).

Almost surely, 2^557731440 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 557731440, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097786880).

557731440 is an abundant number, since it is smaller than the sum of its proper divisors (1637842320).

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

557731440 is a wasteful number, since it uses less digits than its factorization.

557731440 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36916 (or 36904 counting only the distinct ones).

The product of its (nonzero) digits is 58800, while the sum is 36.

The square root of 557731440 is about 23616.3384122095. The cubic root of 557731440 is about 823.1425318364.

The spelling of 557731440 in words is "five hundred fifty-seven million, seven hundred thirty-one thousand, four hundred forty".