681115616 has 48 divisors (see below), whose sum is σ = 1380259440. Its totient is φ = 330654720.

The previous prime is 681115609. The next prime is 681115621. The reversal of 681115616 is 616511186.

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, 299315 + ... + 301581.

It is an arithmetic number, because the mean of its divisors is an integer number (28755405).

Almost surely, 2^681115616 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 681115616, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (690129720).

681115616 is an abundant number, since it is smaller than the sum of its proper divisors (699143824).

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

681115616 is a wasteful number, since it uses less digits than its factorization.

681115616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2547 (or 2539 counting only the distinct ones).

The product of its digits is 8640, while the sum is 35.

The square root of 681115616 is about 26098.1918147599. The cubic root of 681115616 is about 879.8465710472.

The spelling of 681115616 in words is "six hundred eighty-one million, one hundred fifteen thousand, six hundred sixteen".