320745478 has 4 divisors (see below), whose sum is σ = 481118220. Its totient is φ = 160372738.

The previous prime is 320745463. The next prime is 320745487. The reversal of 320745478 is 874547023.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 874547023 = 7 ⋅124935289.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 320745478.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 80186368 + ... + 80186371.

It is an arithmetic number, because the mean of its divisors is an integer number (120279555).

Almost surely, 2^320745478 is an apocalyptic number.

320745478 is a deficient number, since it is larger than the sum of its proper divisors (160372742).

320745478 is a wasteful number, since it uses less digits than its factorization.

320745478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 160372741.

The product of its (nonzero) digits is 188160, while the sum is 40.

The square root of 320745478 is about 17909.3684422427. The cubic root of 320745478 is about 684.5211123517.

The spelling of 320745478 in words is "three hundred twenty million, seven hundred forty-five thousand, four hundred seventy-eight".