780849639431 has 4 divisors (see below), whose sum is σ = 784289505912. Its totient is φ = 777409772952.

The previous prime is 780849639403. The next prime is 780849639487. The reversal of 780849639431 is 134936948087.

780849639431 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-780849639431 is a prime.

It is a super-2 number, since 2×780849639431² (a number of 25 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780849639491) 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, 1719932900 + ... + 1719933353.

It is an arithmetic number, because the mean of its divisors is an integer number (196072376478).

Almost surely, 2^780849639431 is an apocalyptic number.

780849639431 is a deficient number, since it is larger than the sum of its proper divisors (3439866481).

780849639431 is a wasteful number, since it uses less digits than its factorization.

780849639431 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3439866480.

The product of its (nonzero) digits is 31352832, while the sum is 62.

The spelling of 780849639431 in words is "seven hundred eighty billion, eight hundred forty-nine million, six hundred thirty-nine thousand, four hundred thirty-one".