320312990 has 32 divisors (see below), whose sum is σ = 593187840. Its totient is φ = 124471584.

The previous prime is 320312989. The next prime is 320313017. The reversal of 320312990 is 99213023.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62879 + ... + 67781.

It is an arithmetic number, because the mean of its divisors is an integer number (18537120).

Almost surely, 2^320312990 is an apocalyptic number.

320312990 is a deficient number, since it is larger than the sum of its proper divisors (272874850).

320312990 is a wasteful number, since it uses less digits than its factorization.

320312990 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5096.

The product of its (nonzero) digits is 2916, while the sum is 29.

The square root of 320312990 is about 17897.2900183240. The cubic root of 320312990 is about 684.2133082426.

The spelling of 320312990 in words is "three hundred twenty million, three hundred twelve thousand, nine hundred ninety".