320978 has 16 divisors (see below), whose sum is σ = 558144. Its totient is φ = 135600.

The previous prime is 320953. The next prime is 321007. The reversal of 320978 is 879023.

It is a self number, because there is not a number n which added to its sum of digits gives 320978.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 320978.

It is an unprimeable number.

320978 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1301 + ... + 1527.

It is an arithmetic number, because the mean of its divisors is an integer number (34884).

2³²⁰⁹⁷⁸ is an apocalyptic number.

320978 is a deficient number, since it is larger than the sum of its proper divisors (237166).

320978 is a wasteful number, since it uses less digits than its factorization.

320978 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 337.

The product of its (nonzero) digits is 3024, while the sum is 29.

The square root of 320978 is about 566.5492035119. The cubic root of 320978 is about 68.4686485191.

The spelling of 320978 in words is "three hundred twenty thousand, nine hundred seventy-eight".