320694778 has 4 divisors (see below), whose sum is σ = 481042170. Its totient is φ = 160347388.

The previous prime is 320694757. The next prime is 320694779. The reversal of 320694778 is 877496023.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 257698809 + 62995969 = 16053^2 + 7937^2 .

It is not an unprimeable number, because it can be changed into a prime (320694779) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80173693 + ... + 80173696.

Almost surely, 2^320694778 is an apocalyptic number.

320694778 is a deficient number, since it is larger than the sum of its proper divisors (160347392).

320694778 is a wasteful number, since it uses less digits than its factorization.

320694778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160347391.

The product of its (nonzero) digits is 508032, while the sum is 46.

The square root of 320694778 is about 17907.9529260047. The cubic root of 320694778 is about 684.4850432029.

The spelling of 320694778 in words is "three hundred twenty million, six hundred ninety-four thousand, seven hundred seventy-eight".