320355978 has 16 divisors (see below), whose sum is σ = 641624160. Its totient is φ = 106633296.

The previous prime is 320355961. The next prime is 320355991. The reversal of 320355978 is 879553023.

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 7 ways as a sum of consecutive naturals, for example, 33400 + ... + 41907.

It is an arithmetic number, because the mean of its divisors is an integer number (40101510).

Almost surely, 2^320355978 is an apocalyptic number.

320355978 is an abundant number, since it is smaller than the sum of its proper divisors (321268182).

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

320355978 is a wasteful number, since it uses less digits than its factorization.

320355978 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76021.

The product of its (nonzero) digits is 226800, while the sum is 42.

The square root of 320355978 is about 17898.4909419761. The cubic root of 320355978 is about 684.2439154371.

The spelling of 320355978 in words is "three hundred twenty million, three hundred fifty-five thousand, nine hundred seventy-eight".