320891625 has 80 divisors (see below), whose sum is σ = 613621008. Its totient is φ = 166752000.

The previous prime is 320891621. The next prime is 320891657. The reversal of 320891625 is 526198023.

320891625 is a `hidden beast` number, since 3 + 20 + 8 + 9 + 1 + 625 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 268009641 + 52881984 = 16371^2 + 7272^2 .

It is not a de Polignac number, because 320891625 - 2² = 320891621 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320891625.

It is not an unprimeable number, because it can be changed into a prime (320891621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 414739 + ... + 415511.

Almost surely, 2^320891625 is an apocalyptic number.

It is an amenable number.

320891625 is a deficient number, since it is larger than the sum of its proper divisors (292729383).

320891625 is an equidigital number, since it uses as much as digits as its factorization.

320891625 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 841 (or 822 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 36.

The square root of 320891625 is about 17913.4481605301. The cubic root of 320891625 is about 684.6250634316.

The spelling of 320891625 in words is "three hundred twenty million, eight hundred ninety-one thousand, six hundred twenty-five".