780444979 has 4 divisors (see below), whose sum is σ = 793672920. Its totient is φ = 767217040.

The previous prime is 780444961. The next prime is 780445019. The reversal of 780444979 is 979444087.

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

It is a cyclic number.

It is not a de Polignac number, because 780444979 - 2¹¹ = 780442931 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780444179) 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, 6613882 + ... + 6613999.

It is an arithmetic number, because the mean of its divisors is an integer number (198418230).

Almost surely, 2^780444979 is an apocalyptic number.

780444979 is a deficient number, since it is larger than the sum of its proper divisors (13227941).

780444979 is a wasteful number, since it uses less digits than its factorization.

780444979 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13227940.

The product of its (nonzero) digits is 2032128, while the sum is 52.

The square root of 780444979 is about 27936.4453536952. The cubic root of 780444979 is about 920.6914221846.

The spelling of 780444979 in words is "seven hundred eighty million, four hundred forty-four thousand, nine hundred seventy-nine".