531640320 has 208 divisors, whose sum is σ = 1804641120. Its totient is φ = 133169152.

The previous prime is 531640301. The next prime is 531640357. The reversal of 531640320 is 23046135.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (24).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1044226 + ... + 1044734.

Almost surely, 2^531640320 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 531640320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (902320560).

531640320 is an abundant number, since it is smaller than the sum of its proper divisors (1273000800).

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

531640320 is a wasteful number, since it uses less digits than its factorization.

531640320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 558 (or 536 counting only the distinct ones).

The product of its (nonzero) digits is 2160, while the sum is 24.

The square root of 531640320 is about 23057.3268181721. The cubic root of 531640320 is about 810.1012523937.

Adding to 531640320 its reverse (23046135), we get a palindrome (554686455).

The spelling of 531640320 in words is "five hundred thirty-one million, six hundred forty thousand, three hundred twenty".