840779556 has 12 divisors (see below), whose sum is σ = 1961818992. Its totient is φ = 280259848.

The previous prime is 840779509. The next prime is 840779567. The reversal of 840779556 is 655977048.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 840779499 and 840779508.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 35032470 + ... + 35032493.

It is an arithmetic number, because the mean of its divisors is an integer number (163484916).

Almost surely, 2^840779556 is an apocalyptic number.

It is an amenable number.

840779556 is an abundant number, since it is smaller than the sum of its proper divisors (1121039436).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

840779556 is a wasteful number, since it uses less digits than its factorization.

840779556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70064970 (or 70064968 counting only the distinct ones).

The product of its (nonzero) digits is 2116800, while the sum is 51.

The square root of 840779556 is about 28996.1989922817. The cubic root of 840779556 is about 943.8305872970.

The spelling of 840779556 in words is "eight hundred forty million, seven hundred seventy-nine thousand, five hundred fifty-six".