780904 has 8 divisors (see below), whose sum is σ = 1464210. Its totient is φ = 390448.

The previous prime is 780889. The next prime is 780917. The reversal of 780904 is 409087.

It can be written as a sum of positive squares in only one way, i.e., 532900 + 248004 = 730^2 + 498^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×780904² = 1219622114432, which contains 22 as substring.

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 48799 + ... + 48814.

2⁷⁸⁰⁹⁰⁴ is an apocalyptic number.

It is an amenable number.

780904 is a deficient number, since it is larger than the sum of its proper divisors (683306).

780904 is a wasteful number, since it uses less digits than its factorization.

780904 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97619 (or 97615 counting only the distinct ones).

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 780904 is about 883.6877276504. The cubic root of 780904 is about 92.0871889261.

The spelling of 780904 in words is "seven hundred eighty thousand, nine hundred four".