531686720 has 42 divisors (see below), whose sum is σ = 1267061982. Its totient is φ = 212509696.

The previous prime is 531686719. The next prime is 531686723. The reversal of 531686720 is 27686135.

It can be written as a sum of positive squares in 3 ways, for example, as 198697216 + 332989504 = 14096^2 + 18248^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (531686723) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 411836 + ... + 413124.

Almost surely, 2^531686720 is an apocalyptic number.

It is an amenable number.

531686720 is an abundant number, since it is smaller than the sum of its proper divisors (735375262).

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

531686720 is an frugal number, since it uses more digits than its factorization.

531686720 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2595 (or 1296 counting only the distinct ones).

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 531686720 is about 23058.3329839778. The cubic root of 531686720 is about 810.1248194579.

The spelling of 531686720 in words is "five hundred thirty-one million, six hundred eighty-six thousand, seven hundred twenty".