320780279 has 4 divisors (see below), whose sum is σ = 320816784. Its totient is φ = 320743776.

The previous prime is 320780267. The next prime is 320780321. The reversal of 320780279 is 972087023.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 320780279 - 2¹⁶ = 320714743 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320780179) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3854 + ... + 25620.

It is an arithmetic number, because the mean of its divisors is an integer number (80204196).

Almost surely, 2^320780279 is an apocalyptic number.

320780279 is a deficient number, since it is larger than the sum of its proper divisors (36505).

320780279 is a wasteful number, since it uses less digits than its factorization.

320780279 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 36504.

The product of its (nonzero) digits is 42336, while the sum is 38.

The square root of 320780279 is about 17910.3400023562. The cubic root of 320780279 is about 684.5458683856.

The spelling of 320780279 in words is "three hundred twenty million, seven hundred eighty thousand, two hundred seventy-nine".