681998196 has 24 divisors (see below), whose sum is σ = 1735995744. Its totient is φ = 206666080.

The previous prime is 681998167. The next prime is 681998201. The reversal of 681998196 is 691899186.

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, 2583195 + ... + 2583458.

It is an arithmetic number, because the mean of its divisors is an integer number (72333156).

Almost surely, 2^681998196 is an apocalyptic number.

681998196 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

681998196 is an abundant number, since it is smaller than the sum of its proper divisors (1053997548).

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

681998196 is a wasteful number, since it uses less digits than its factorization.

681998196 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5166671 (or 5166669 counting only the distinct ones).

The product of its digits is 1679616, while the sum is 57.

The square root of 681998196 is about 26115.0951750132. The cubic root of 681998196 is about 880.2264379411.

The spelling of 681998196 in words is "six hundred eighty-one million, nine hundred ninety-eight thousand, one hundred ninety-six".