681803528 has 64 divisors (see below), whose sum is σ = 1520640000. Its totient is φ = 280510272.

The previous prime is 681803519. The next prime is 681803531. The reversal of 681803528 is 825308186.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 139673 + ... + 144471.

It is an arithmetic number, because the mean of its divisors is an integer number (23760000).

Almost surely, 2^681803528 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 681803528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (760320000).

681803528 is an abundant number, since it is smaller than the sum of its proper divisors (838836472).

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

681803528 is a wasteful number, since it uses less digits than its factorization.

681803528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4914 (or 4910 counting only the distinct ones).

The product of its (nonzero) digits is 92160, while the sum is 41.

The square root of 681803528 is about 26111.3677925918. The cubic root of 681803528 is about 880.1426800332.

The spelling of 681803528 in words is "six hundred eighty-one million, eight hundred three thousand, five hundred twenty-eight".