320749990 has 32 divisors (see below), whose sum is σ = 630957600. Its totient is φ = 116428800.

The previous prime is 320749969. The next prime is 320750021. The reversal of 320749990 is 99947023.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 68236 + ... + 72784.

It is an arithmetic number, because the mean of its divisors is an integer number (19717425).

Almost surely, 2^320749990 is an apocalyptic number.

320749990 is a deficient number, since it is larger than the sum of its proper divisors (310207610).

320749990 is a wasteful number, since it uses less digits than its factorization.

320749990 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5208.

The product of its (nonzero) digits is 122472, while the sum is 43.

The square root of 320749990 is about 17909.4944093908. The cubic root of 320749990 is about 684.5243221084.

The spelling of 320749990 in words is "three hundred twenty million, seven hundred forty-nine thousand, nine hundred ninety".