681954268 has 6 divisors (see below), whose sum is σ = 1193419976. Its totient is φ = 340977132.

The previous prime is 681954263. The next prime is 681954283. The reversal of 681954268 is 862459186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681954263) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 85244280 + ... + 85244287.

Almost surely, 2^681954268 is an apocalyptic number.

It is an amenable number.

681954268 is a deficient number, since it is larger than the sum of its proper divisors (511465708).

681954268 is a wasteful number, since it uses less digits than its factorization.

681954268 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 170488571 (or 170488569 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The square root of 681954268 is about 26114.2541153294. The cubic root of 681954268 is about 880.2075388602.

The spelling of 681954268 in words is "six hundred eighty-one million, nine hundred fifty-four thousand, two hundred sixty-eight".