780331313 has 4 divisors (see below), whose sum is σ = 786027300. Its totient is φ = 774635328.

The previous prime is 780331309. The next prime is 780331319. The reversal of 780331313 is 313133087.

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

It can be written as a sum of positive squares in 2 ways, for example, as 448253584 + 332077729 = 21172^2 + 18223^2 .

It is a cyclic number.

It is not a de Polignac number, because 780331313 - 2² = 780331309 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780331319) 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, 2847788 + ... + 2848061.

It is an arithmetic number, because the mean of its divisors is an integer number (196506825).

Almost surely, 2^780331313 is an apocalyptic number.

It is an amenable number.

780331313 is a deficient number, since it is larger than the sum of its proper divisors (5695987).

780331313 is a wasteful number, since it uses less digits than its factorization.

780331313 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5695986.

The product of its (nonzero) digits is 4536, while the sum is 29.

The square root of 780331313 is about 27934.4109119917. The cubic root of 780331313 is about 920.6467227311.

The spelling of 780331313 in words is "seven hundred eighty million, three hundred thirty-one thousand, three hundred thirteen".