320778 has 24 divisors (see below), whose sum is σ = 707616. Its totient is φ = 105000.

The previous prime is 320767. The next prime is 320791. The reversal of 320778 is 877023.

It is an unprimeable number.

320778 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 11 ways as a sum of consecutive naturals, for example, 1153 + ... + 1403.

It is an arithmetic number, because the mean of its divisors is an integer number (29484).

2³²⁰⁷⁷⁸ is an apocalyptic number.

320778 is an abundant number, since it is smaller than the sum of its proper divisors (386838).

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

320778 is a wasteful number, since it uses less digits than its factorization.

320778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 330 (or 327 counting only the distinct ones).

The product of its (nonzero) digits is 2352, while the sum is 27.

The square root of 320778 is about 566.3726688321. The cubic root of 320778 is about 68.4544247251.

The spelling of 320778 in words is "three hundred twenty thousand, seven hundred seventy-eight".