681708724 has 12 divisors (see below), whose sum is σ = 1231474048. Its totient is φ = 329859000.

The previous prime is 681708697. The next prime is 681708751. The reversal of 681708724 is 427807186.

It is an interprime number because it is at equal distance from previous prime (681708697) and next prime (681708751).

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 2748702 + ... + 2748949.

Almost surely, 2^681708724 is an apocalyptic number.

It is an amenable number.

681708724 is a deficient number, since it is larger than the sum of its proper divisors (549765324).

681708724 is a wasteful number, since it uses less digits than its factorization.

681708724 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5497686 (or 5497684 counting only the distinct ones).

The product of its (nonzero) digits is 150528, while the sum is 43.

The square root of 681708724 is about 26109.5523515820. The cubic root of 681708724 is about 880.1018838649.

The spelling of 681708724 in words is "six hundred eighty-one million, seven hundred eight thousand, seven hundred twenty-four".