681738688 has 28 divisors (see below), whose sum is σ = 1366232472. Its totient is φ = 337491200.

The previous prime is 681738683. The next prime is 681738703. The reversal of 681738688 is 886837186.

It is a super-2 number, since 2×681738688² = 929535277431922688, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681738683) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 46270 + ... + 59197.

Almost surely, 2^681738688 is an apocalyptic number.

It is an amenable number.

681738688 is an abundant number, since it is smaller than the sum of its proper divisors (684493784).

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

681738688 is a wasteful number, since it uses less digits than its factorization.

681738688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 105580 (or 105570 counting only the distinct ones).

The product of its digits is 3096576, while the sum is 55.

The square root of 681738688 is about 26110.1261582552. The cubic root of 681738688 is about 880.1147784172.

The spelling of 681738688 in words is "six hundred eighty-one million, seven hundred thirty-eight thousand, six hundred eighty-eight".