681668184 has 64 divisors (see below), whose sum is σ = 1738275840. Its totient is φ = 222710400.

The previous prime is 681668153. The next prime is 681668191. The reversal of 681668184 is 481866186.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 357634 + ... + 359534.

It is an arithmetic number, because the mean of its divisors is an integer number (27160560).

Almost surely, 2^681668184 is an apocalyptic number.

It is an amenable number.

681668184 is an abundant number, since it is smaller than the sum of its proper divisors (1056607656).

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

681668184 is a wasteful number, since it uses less digits than its factorization.

681668184 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2200 (or 2196 counting only the distinct ones).

The product of its digits is 442368, while the sum is 48.

The square root of 681668184 is about 26108.7759958218. The cubic root of 681668184 is about 880.0844374901.

The spelling of 681668184 in words is "six hundred eighty-one million, six hundred sixty-eight thousand, one hundred eighty-four".