320005678 has 4 divisors (see below), whose sum is σ = 480008520. Its totient is φ = 160002838.

The previous prime is 320005597. The next prime is 320005681. The reversal of 320005678 is 876500023.

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

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80001418 + ... + 80001421.

It is an arithmetic number, because the mean of its divisors is an integer number (120002130).

Almost surely, 2^320005678 is an apocalyptic number.

320005678 is a deficient number, since it is larger than the sum of its proper divisors (160002842).

320005678 is a wasteful number, since it uses less digits than its factorization.

320005678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160002841.

The product of its (nonzero) digits is 10080, while the sum is 31.

The square root of 320005678 is about 17888.7025242190. The cubic root of 320005678 is about 683.9944241648.

The spelling of 320005678 in words is "three hundred twenty million, five thousand, six hundred seventy-eight".