681298864 has 10 divisors (see below), whose sum is σ = 1320016580. Its totient is φ = 340649424.

The previous prime is 681298861. The next prime is 681298921. The reversal of 681298864 is 468892186.

681298864 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a zygodrome in base 14.

It is not an unprimeable number, because it can be changed into a prime (681298861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 21290574 + ... + 21290605.

It is an arithmetic number, because the mean of its divisors is an integer number (132001658).

Almost surely, 2^681298864 is an apocalyptic number.

It is an amenable number.

681298864 is a deficient number, since it is larger than the sum of its proper divisors (638717716).

681298864 is a wasteful number, since it uses less digits than its factorization.

681298864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42581187 (or 42581181 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 52.

The square root of 681298864 is about 26101.7023199637. The cubic root of 681298864 is about 879.9254688944.

The spelling of 681298864 in words is "six hundred eighty-one million, two hundred ninety-eight thousand, eight hundred sixty-four".