320689965 has 32 divisors (see below), whose sum is σ = 519716736. Its totient is φ = 168846080.

The previous prime is 320689951. The next prime is 320689969. The reversal of 320689965 is 569986023.

It is not a de Polignac number, because 320689965 - 2⁸ = 320689709 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320689969) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 575467 + ... + 576023.

It is an arithmetic number, because the mean of its divisors is an integer number (16241148).

Almost surely, 2^320689965 is an apocalyptic number.

It is an amenable number.

320689965 is a deficient number, since it is larger than the sum of its proper divisors (199026771).

320689965 is a wasteful number, since it uses less digits than its factorization.

320689965 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 989.

The product of its (nonzero) digits is 699840, while the sum is 48.

The square root of 320689965 is about 17907.8185438651. The cubic root of 320689965 is about 684.4816189262.

The spelling of 320689965 in words is "three hundred twenty million, six hundred eighty-nine thousand, nine hundred sixty-five".