684078956 has 18 divisors (see below), whose sum is σ = 1306300212. Its totient is φ = 310866120.

The previous prime is 684078919. The next prime is 684078961. The reversal of 684078956 is 659870486.

684078956 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a junction number, because it is equal to n+sod(n) for n = 684078898 and 684078907.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 171521 + ... + 175463.

It is an arithmetic number, because the mean of its divisors is an integer number (72572234).

Almost surely, 2^684078956 is an apocalyptic number.

It is an amenable number.

684078956 is a deficient number, since it is larger than the sum of its proper divisors (622221256).

684078956 is an equidigital number, since it uses as much as digits as its factorization.

684078956 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7901 (or 3956 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 53.

The square root of 684078956 is about 26154.9030967427. The cubic root of 684078956 is about 881.1207122774.

The spelling of 684078956 in words is "six hundred eighty-four million, seventy-eight thousand, nine hundred fifty-six".