681980922 has 72 divisors (see below), whose sum is σ = 1735789536. Its totient is φ = 192934224.

The previous prime is 681980917. The next prime is 681980939. The reversal of 681980922 is 229089186.

It is a Smith number, since the sum of its digits (45) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 87093 + ... + 94599.

It is an arithmetic number, because the mean of its divisors is an integer number (24108188).

Almost surely, 2^681980922 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681980922, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (867894768).

681980922 is an abundant number, since it is smaller than the sum of its proper divisors (1053808614).

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

681980922 is a wasteful number, since it uses less digits than its factorization.

681980922 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7632 (or 7622 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 681980922 is about 26114.7644446585. The cubic root of 681980922 is about 880.2190062695.

The spelling of 681980922 in words is "six hundred eighty-one million, nine hundred eighty thousand, nine hundred twenty-two".