780791 has 4 divisors (see below), whose sum is σ = 851784. Its totient is φ = 709800.

The previous prime is 780733. The next prime is 780799. The reversal of 780791 is 197087.

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 780791 - 2¹⁰ = 779767 is a prime.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780799) 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, 35480 + ... + 35501.

It is an arithmetic number, because the mean of its divisors is an integer number (212946).

2⁷⁸⁰⁷⁹¹ is an apocalyptic number.

780791 is a deficient number, since it is larger than the sum of its proper divisors (70993).

780791 is a wasteful number, since it uses less digits than its factorization.

780791 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70992.

The product of its (nonzero) digits is 3528, while the sum is 32.

The square root of 780791 is about 883.6237887246. The cubic root of 780791 is about 92.0827469143.

The spelling of 780791 in words is "seven hundred eighty thousand, seven hundred ninety-one".