780641679 has 4 divisors (see below), whose sum is σ = 1040855576. Its totient is φ = 520427784.

The previous prime is 780641669. The next prime is 780641711. The reversal of 780641679 is 976146087.

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

It is not a de Polignac number, because 780641679 - 2⁵ = 780641647 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 (780641669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 130106944 + ... + 130106949.

It is an arithmetic number, because the mean of its divisors is an integer number (260213894).

Almost surely, 2^780641679 is an apocalyptic number.

780641679 is a deficient number, since it is larger than the sum of its proper divisors (260213897).

780641679 is a wasteful number, since it uses less digits than its factorization.

780641679 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 260213896.

The product of its (nonzero) digits is 508032, while the sum is 48.

The square root of 780641679 is about 27939.9656227419. The cubic root of 780641679 is about 920.7687647243.

The spelling of 780641679 in words is "seven hundred eighty million, six hundred forty-one thousand, six hundred seventy-nine".