320989645 has 4 divisors (see below), whose sum is σ = 385187580. Its totient is φ = 256791712.

The previous prime is 320989583. The next prime is 320989703. The reversal of 320989645 is 546989023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 199063881 + 121925764 = 14109^2 + 11042^2 .

It is a cyclic number.

It is not a de Polignac number, because 320989645 - 2⁷ = 320989517 is a prime.

It is a super-3 number, since 3×320989645³ (a number of 26 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 320989595 and 320989604.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 32098960 + ... + 32098969.

It is an arithmetic number, because the mean of its divisors is an integer number (96296895).

Almost surely, 2^320989645 is an apocalyptic number.

It is an amenable number.

320989645 is a deficient number, since it is larger than the sum of its proper divisors (64197935).

320989645 is an equidigital number, since it uses as much as digits as its factorization.

320989645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 64197934.

The product of its (nonzero) digits is 466560, while the sum is 46.

The square root of 320989645 is about 17916.1838849684. The cubic root of 320989645 is about 684.6947651749.

The spelling of 320989645 in words is "three hundred twenty million, nine hundred eighty-nine thousand, six hundred forty-five".