320797778 has 16 divisors (see below), whose sum is σ = 554140224. Its totient is φ = 136434480.

The previous prime is 320797747. The next prime is 320797783. The reversal of 320797778 is 877797023.

It is a super-2 number, since 2×320797778² = 205822428739474568, which contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 85625 + ... + 89292.

It is an arithmetic number, because the mean of its divisors is an integer number (34633764).

Almost surely, 2^320797778 is an apocalyptic number.

320797778 is a deficient number, since it is larger than the sum of its proper divisors (233342446).

320797778 is a wasteful number, since it uses less digits than its factorization.

320797778 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 175057.

The product of its (nonzero) digits is 1037232, while the sum is 50.

The square root of 320797778 is about 17910.8285123832. The cubic root of 320797778 is about 684.5583157949.

The spelling of 320797778 in words is "three hundred twenty million, seven hundred ninety-seven thousand, seven hundred seventy-eight".