780091 has 8 divisors (see below), whose sum is σ = 876960. Its totient is φ = 688512.

The previous prime is 780061. The next prime is 780119. The reversal of 780091 is 190087.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 780091 - 2⁹ = 779579 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (780041) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1006 + ... + 1603.

It is an arithmetic number, because the mean of its divisors is an integer number (109620).

2⁷⁸⁰⁰⁹¹ is an apocalyptic number.

780091 is a deficient number, since it is larger than the sum of its proper divisors (96869).

780091 is a wasteful number, since it uses less digits than its factorization.

780091 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2645.

The product of its (nonzero) digits is 504, while the sum is 25.

The square root of 780091 is about 883.2276037353. The cubic root of 780091 is about 92.0552204720.

The spelling of 780091 in words is "seven hundred eighty thousand, ninety-one".