780764139 has 12 divisors (see below), whose sum is σ = 1128090600. Its totient is φ = 520361664.

The previous prime is 780764099. The next prime is 780764143. The reversal of 780764139 is 931467087.

It is not a de Polignac number, because 780764139 - 2⁸ = 780763883 is a prime.

It is a super-2 number, since 2×780764139² = 1219185281496822642, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 780764094 and 780764103.

It is not an unprimeable number, because it can be changed into a prime (780764339) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 28147 + ... + 48515.

It is an arithmetic number, because the mean of its divisors is an integer number (94007550).

Almost surely, 2^780764139 is an apocalyptic number.

780764139 is a deficient number, since it is larger than the sum of its proper divisors (347326461).

780764139 is a wasteful number, since it uses less digits than its factorization.

780764139 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 24634 (or 24631 counting only the distinct ones).

The product of its (nonzero) digits is 254016, while the sum is 45.

The square root of 780764139 is about 27942.1570212466. The cubic root of 780764139 is about 920.8169094964.

It can be divided in two parts, 78076 and 4139, that added together give a triangular number (82215 = T₄₀₅).

The spelling of 780764139 in words is "seven hundred eighty million, seven hundred sixty-four thousand, one hundred thirty-nine".