681026726 has 16 divisors (see below), whose sum is σ = 1044382896. Its totient is φ = 332973696.

The previous prime is 681026683. The next prime is 681026741. The reversal of 681026726 is 627620186.

It is a happy number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 681026726.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 191 + ... + 36906.

It is an arithmetic number, because the mean of its divisors is an integer number (65273931).

Almost surely, 2^681026726 is an apocalyptic number.

681026726 is a deficient number, since it is larger than the sum of its proper divisors (363356170).

681026726 is a wasteful number, since it uses less digits than its factorization.

681026726 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 37303.

The product of its (nonzero) digits is 48384, while the sum is 38.

The square root of 681026726 is about 26096.4887676484. The cubic root of 681026726 is about 879.8082941564.

The spelling of 681026726 in words is "six hundred eighty-one million, twenty-six thousand, seven hundred twenty-six".