681255680 has 144 divisors (see below), whose sum is σ = 1881788160. Its totient is φ = 231469056.

The previous prime is 681255661. The next prime is 681255683. The reversal of 681255680 is 86552186.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681255683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1245167 + ... + 1245713.

Almost surely, 2^681255680 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 681255680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (940894080).

681255680 is an abundant number, since it is smaller than the sum of its proper divisors (1200532480).

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

681255680 is a wasteful number, since it uses less digits than its factorization.

681255680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 714 (or 700 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 681255680 is about 26100.8750811156. The cubic root of 681255680 is about 879.9068771983.

The spelling of 681255680 in words is "six hundred eighty-one million, two hundred fifty-five thousand, six hundred eighty".