780056 has 16 divisors (see below), whose sum is σ = 1472040. Its totient is φ = 387520.

The previous prime is 780049. The next prime is 780061. The reversal of 780056 is 650087.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

780056 is an untouchable number, because it is not equal to the sum of proper divisors of any 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 in 3 ways as a sum of consecutive naturals, for example, 2075 + ... + 2421.

2⁷⁸⁰⁰⁵⁶ is an apocalyptic number.

It is an amenable number.

780056 is a deficient number, since it is larger than the sum of its proper divisors (691984).

780056 is a wasteful number, since it uses less digits than its factorization.

780056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 634 (or 630 counting only the distinct ones).

The product of its (nonzero) digits is 1680, while the sum is 26.

The square root of 780056 is about 883.2077898207. The cubic root of 780056 is about 92.0538437177.

The spelling of 780056 in words is "seven hundred eighty thousand, fifty-six".