531649320 has 32 divisors (see below), whose sum is σ = 1594948320. Its totient is φ = 141773120.

The previous prime is 531649303. The next prime is 531649331. The reversal of 531649320 is 23946135.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2215086 + ... + 2215325.

It is an arithmetic number, because the mean of its divisors is an integer number (49842135).

Almost surely, 2^531649320 is an apocalyptic number.

It is an amenable number.

531649320 is an abundant number, since it is smaller than the sum of its proper divisors (1063299000).

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

531649320 is a wasteful number, since it uses less digits than its factorization.

531649320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4430425 (or 4430421 counting only the distinct ones).

The product of its (nonzero) digits is 19440, while the sum is 33.

The square root of 531649320 is about 23057.5219830753. The cubic root of 531649320 is about 810.1058236987.

The spelling of 531649320 in words is "five hundred thirty-one million, six hundred forty-nine thousand, three hundred twenty".