780856 has 8 divisors (see below), whose sum is σ = 1464120. Its totient is φ = 390424.

The previous prime is 780853. The next prime is 780869. The reversal of 780856 is 658087.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (780851) by changing a digit.

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, 48796 + ... + 48811.

It is an arithmetic number, because the mean of its divisors is an integer number (183015).

2⁷⁸⁰⁸⁵⁶ is an apocalyptic number.

It is an amenable number.

780856 is a deficient number, since it is larger than the sum of its proper divisors (683264).

780856 is a wasteful number, since it uses less digits than its factorization.

780856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97613 (or 97609 counting only the distinct ones).

The product of its (nonzero) digits is 13440, while the sum is 34.

The square root of 780856 is about 883.6605683179. The cubic root of 780856 is about 92.0853021061.

The spelling of 780856 in words is "seven hundred eighty thousand, eight hundred fifty-six".