681884968 has 8 divisors (see below), whose sum is σ = 1278534330. Its totient is φ = 340942480.

The previous prime is 681884921. The next prime is 681884969. The reversal of 681884968 is 869488186.

It can be written as a sum of positive squares in only one way, i.e., 522671044 + 159213924 = 22862^2 + 12618^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×681884968² = 929934219168722048, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (681884969) by changing a digit.

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 as a sum of consecutive naturals, namely, 42617803 + ... + 42617818.

Almost surely, 2^681884968 is an apocalyptic number.

It is an amenable number.

681884968 is a deficient number, since it is larger than the sum of its proper divisors (596649362).

681884968 is a wasteful number, since it uses less digits than its factorization.

681884968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85235627 (or 85235623 counting only the distinct ones).

The product of its digits is 5308416, while the sum is 58.

The square root of 681884968 is about 26112.9272200571. The cubic root of 681884968 is about 880.1777223697.

The spelling of 681884968 in words is "six hundred eighty-one million, eight hundred eighty-four thousand, nine hundred sixty-eight".