320565725 has 12 divisors (see below), whose sum is σ = 397918356. Its totient is φ = 256183680.

The previous prime is 320565691. The next prime is 320565769. The reversal of 320565725 is 527565023.

It can be written as a sum of positive squares in 6 ways, for example, as 942841 + 319622884 = 971^2 + 17878^2 .

It is not a de Polignac number, because 320565725 - 2¹² = 320561629 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 19619 + ... + 32031.

It is an arithmetic number, because the mean of its divisors is an integer number (33159863).

Almost surely, 2^320565725 is an apocalyptic number.

It is an amenable number.

320565725 is a deficient number, since it is larger than the sum of its proper divisors (77352631).

320565725 is a wasteful number, since it uses less digits than its factorization.

320565725 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13456 (or 13451 counting only the distinct ones).

The product of its (nonzero) digits is 63000, while the sum is 35.

The square root of 320565725 is about 17904.3493319361. The cubic root of 320565725 is about 684.3932147665.

The spelling of 320565725 in words is "three hundred twenty million, five hundred sixty-five thousand, seven hundred twenty-five".