681264668 has 24 divisors (see below), whose sum is σ = 1364947584. Its totient is φ = 291452400.

The previous prime is 681264631. The next prime is 681264673. The reversal of 681264668 is 866462186.

It is a happy number.

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 7 ways as a sum of consecutive naturals, for example, 5318 + ... + 37293.

It is an arithmetic number, because the mean of its divisors is an integer number (56872816).

Almost surely, 2^681264668 is an apocalyptic number.

It is an amenable number.

681264668 is an abundant number, since it is smaller than the sum of its proper divisors (683682916).

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

681264668 is a wasteful number, since it uses less digits than its factorization.

681264668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 43193 (or 43191 counting only the distinct ones).

The product of its digits is 663552, while the sum is 47.

The square root of 681264668 is about 26101.0472586829. The cubic root of 681264668 is about 879.9107468019.

The spelling of 681264668 in words is "six hundred eighty-one million, two hundred sixty-four thousand, six hundred sixty-eight".