681989152 has 48 divisors (see below), whose sum is σ = 1460941272. Its totient is φ = 311500800.

The previous prime is 681989093. The next prime is 681989167. The reversal of 681989152 is 251989186.

It can be written as a sum of positive squares in 4 ways, for example, as 646990096 + 34999056 = 25436^2 + 5916^2 .

It is a junction number, because it is equal to n+sod(n) for n = 681989096 and 681989105.

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, 31902 + ... + 48802.

Almost surely, 2^681989152 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681989152, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (730470636).

681989152 is an abundant number, since it is smaller than the sum of its proper divisors (778952120).

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

681989152 is a wasteful number, since it uses less digits than its factorization.

681989152 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17021 (or 17013 counting only the distinct ones).

The product of its digits is 311040, while the sum is 49.

The square root of 681989152 is about 26114.9220178809. The cubic root of 681989152 is about 880.2225470202. Note that the first 3 decimals are identical.

The spelling of 681989152 in words is "six hundred eighty-one million, nine hundred eighty-nine thousand, one hundred fifty-two".