531660520728 has 24 divisors (see below), whose sum is σ = 1439913910500. Its totient is φ = 177220173552.

The previous prime is 531660520697. The next prime is 531660520733. The reversal of 531660520728 is 827025066135.

531660520728 is a `hidden beast` number, since 5 + 3 + 16 + 605 + 2 + 0 + 7 + 28 = 666.

It is a tau number, because it is divible by the number of its divisors (24).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 3692086878 + ... + 3692087021.

Almost surely, 2^531660520728 is an apocalyptic number.

It is an amenable number.

531660520728 is an abundant number, since it is smaller than the sum of its proper divisors (908253389772).

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

531660520728 is a wasteful number, since it uses less digits than its factorization.

531660520728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7384173911 (or 7384173904 counting only the distinct ones).

The product of its (nonzero) digits is 604800, while the sum is 45.

The spelling of 531660520728 in words is "five hundred thirty-one billion, six hundred sixty million, five hundred twenty thousand, seven hundred twenty-eight".