320998564 has 12 divisors (see below), whose sum is σ = 581118300. Its totient is φ = 154964768.

The previous prime is 320998547. The next prime is 320998571. The reversal of 320998564 is 465899023.

It can be written as a sum of positive squares in 2 ways, for example, as 147865600 + 173132964 = 12160^2 + 13158^2 .

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, 1383499 + ... + 1383730.

It is an arithmetic number, because the mean of its divisors is an integer number (48426525).

Almost surely, 2^320998564 is an apocalyptic number.

It is an amenable number.

320998564 is a deficient number, since it is larger than the sum of its proper divisors (260119736).

320998564 is a wasteful number, since it uses less digits than its factorization.

320998564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2767262 (or 2767260 counting only the distinct ones).

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

The square root of 320998564 is about 17916.4327922720. The cubic root of 320998564 is about 684.7011067461.

The spelling of 320998564 in words is "three hundred twenty million, nine hundred ninety-eight thousand, five hundred sixty-four".