681671268 has 48 divisors (see below), whose sum is σ = 1804911360. Its totient is φ = 222387552.

The previous prime is 681671261. The next prime is 681671293. The reversal of 681671268 is 862176186.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (681671261) 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 in 15 ways as a sum of consecutive naturals, for example, 62071 + ... + 72222.

It is an arithmetic number, because the mean of its divisors is an integer number (37602320).

Almost surely, 2^681671268 is an apocalyptic number.

It is an amenable number.

681671268 is an abundant number, since it is smaller than the sum of its proper divisors (1123240092).

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

681671268 is a wasteful number, since it uses less digits than its factorization.

681671268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 134353 (or 134345 counting only the distinct ones).

The product of its digits is 193536, while the sum is 45.

The square root of 681671268 is about 26108.8350563559. The cubic root of 681671268 is about 880.0857647127.

The spelling of 681671268 in words is "six hundred eighty-one million, six hundred seventy-one thousand, two hundred sixty-eight".