681305900 has 54 divisors (see below), whose sum is σ = 1614888828. Its totient is φ = 247432800.

The previous prime is 681305893. The next prime is 681305921. The reversal of 681305900 is 9503186.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 865307 + ... + 866093.

Almost surely, 2^681305900 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 681305900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (807444414).

681305900 is an abundant number, since it is smaller than the sum of its proper divisors (933582928).

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

681305900 is a wasteful number, since it uses less digits than its factorization.

681305900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1599 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 6480, while the sum is 32.

The square root of 681305900 is about 26101.8371000970. The cubic root of 681305900 is about 879.9284979783.

The spelling of 681305900 in words is "six hundred eighty-one million, three hundred five thousand, nine hundred".