685156972 has 12 divisors (see below), whose sum is σ = 1231431040. Its totient is φ = 333319536.

The previous prime is 685156963. The next prime is 685156973. The reversal of 685156972 is 279651586.

685156972 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a hoax number, since the sum of its digits (49) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (685156973) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2314572 + ... + 2314867.

Almost surely, 2^685156972 is an apocalyptic number.

It is an amenable number.

685156972 is a deficient number, since it is larger than the sum of its proper divisors (546274068).

685156972 is a wasteful number, since it uses less digits than its factorization.

685156972 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4629480 (or 4629478 counting only the distinct ones).

The product of its digits is 907200, while the sum is 49.

The square root of 685156972 is about 26175.5032807394. The cubic root of 685156972 is about 881.5833117587.

The spelling of 685156972 in words is "six hundred eighty-five million, one hundred fifty-six thousand, nine hundred seventy-two".