320488985 has 4 divisors (see below), whose sum is σ = 384586788. Its totient is φ = 256391184.

The previous prime is 320488963. The next prime is 320488991. The reversal of 320488985 is 589884023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 589884023 = 997 ⋅591659.

It can be written as a sum of positive squares in 2 ways, for example, as 246992656 + 73496329 = 15716^2 + 8573^2 .

It is a cyclic number.

It is not a de Polignac number, because 320488985 - 2¹² = 320484889 is a prime.

It is a Duffinian number.

It is a Curzon 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, 32048894 + ... + 32048903.

It is an arithmetic number, because the mean of its divisors is an integer number (96146697).

Almost surely, 2^320488985 is an apocalyptic number.

It is an amenable number.

320488985 is a deficient number, since it is larger than the sum of its proper divisors (64097803).

320488985 is an equidigital number, since it uses as much as digits as its factorization.

320488985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64097802.

The product of its (nonzero) digits is 552960, while the sum is 47.

The square root of 320488985 is about 17902.2061489639. The cubic root of 320488985 is about 684.3385982737.

The spelling of 320488985 in words is "three hundred twenty million, four hundred eighty-eight thousand, nine hundred eighty-five".