681115880 has 128 divisors (see below), whose sum is σ = 1700352000. Its totient is φ = 244408320.

The previous prime is 681115871. The next prime is 681115901. The reversal of 681115880 is 88511186.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1665116 + ... + 1665524.

It is an arithmetic number, because the mean of its divisors is an integer number (13284000).

Almost surely, 2^681115880 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 681115880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (850176000).

681115880 is an abundant number, since it is smaller than the sum of its proper divisors (1019236120).

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

681115880 is a wasteful number, since it uses less digits than its factorization.

681115880 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 547 (or 543 counting only the distinct ones).

The product of its (nonzero) digits is 15360, while the sum is 38.

The square root of 681115880 is about 26098.1968725811. The cubic root of 681115880 is about 879.8466847232.

The spelling of 681115880 in words is "six hundred eighty-one million, one hundred fifteen thousand, eight hundred eighty".