320561008 has 20 divisors (see below), whose sum is σ = 653776360. Its totient is φ = 151844544.

The previous prime is 320560997. The next prime is 320561053. The reversal of 320561008 is 800165023.

It is a happy number.

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, 526935 + ... + 527542.

It is an arithmetic number, because the mean of its divisors is an integer number (32688818).

Almost surely, 2^320561008 is an apocalyptic number.

320561008 is a gapful number since it is divisible by the number (38) formed by its first and last digit.

It is an amenable number.

320561008 is an abundant number, since it is smaller than the sum of its proper divisors (333215352).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

320561008 is a wasteful number, since it uses less digits than its factorization.

320561008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1054504 (or 1054498 counting only the distinct ones).

The product of its (nonzero) digits is 1440, while the sum is 25.

The square root of 320561008 is about 17904.2176036821. The cubic root of 320561008 is about 684.3898578900.

The spelling of 320561008 in words is "three hundred twenty million, five hundred sixty-one thousand, eight".