684959956 has 36 divisors (see below), whose sum is σ = 1269662688. Its totient is φ = 323283024.

The previous prime is 684959953. The next prime is 684959959. The reversal of 684959956 is 659959486.

It is an interprime number because it is at equal distance from previous prime (684959953) and next prime (684959959).

It is a junction number, because it is equal to n+sod(n) for n = 684959894 and 684959903.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (684959953) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 500385 + ... + 501751.

It is an arithmetic number, because the mean of its divisors is an integer number (35268408).

Almost surely, 2^684959956 is an apocalyptic number.

It is an amenable number.

684959956 is a deficient number, since it is larger than the sum of its proper divisors (584702732).

684959956 is a wasteful number, since it uses less digits than its factorization.

684959956 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1756 (or 1735 counting only the distinct ones).

The product of its digits is 20995200, while the sum is 61.

The square root of 684959956 is about 26171.7396441276. The cubic root of 684959956 is about 881.4988042783.

The spelling of 684959956 in words is "six hundred eighty-four million, nine hundred fifty-nine thousand, nine hundred fifty-six".