320778401 has 4 divisors (see below), whose sum is σ = 334725312. Its totient is φ = 306831492.

The previous prime is 320778397. The next prime is 320778413. The reversal of 320778401 is 104877023.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 320778401 - 2² = 320778397 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (320718401) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6973421 + ... + 6973466.

It is an arithmetic number, because the mean of its divisors is an integer number (83681328).

Almost surely, 2^320778401 is an apocalyptic number.

It is an amenable number.

320778401 is a deficient number, since it is larger than the sum of its proper divisors (13946911).

320778401 is a wasteful number, since it uses less digits than its factorization.

320778401 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13946910.

The product of its (nonzero) digits is 9408, while the sum is 32.

The square root of 320778401 is about 17910.2875744640. The cubic root of 320778401 is about 684.5445324975.

The spelling of 320778401 in words is "three hundred twenty million, seven hundred seventy-eight thousand, four hundred one".