681879528 has 288 divisors, whose sum is σ = 2195968320. Its totient is φ = 190502400.

The previous prime is 681879521. The next prime is 681879563. The reversal of 681879528 is 825978186.

It is not an unprimeable number, because it can be changed into a prime (681879521) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 8215375 + ... + 8215457.

It is an arithmetic number, because the mean of its divisors is an integer number (7624890).

Almost surely, 2^681879528 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 681879528, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1097984160).

681879528 is an abundant number, since it is smaller than the sum of its proper divisors (1514088792).

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

681879528 is a wasteful number, since it uses less digits than its factorization.

681879528 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 181 (or 163 counting only the distinct ones).

The product of its digits is 1935360, while the sum is 54.

The square root of 681879528 is about 26112.8230568815. The cubic root of 681879528 is about 880.1753817112.

The spelling of 681879528 in words is "six hundred eighty-one million, eight hundred seventy-nine thousand, five hundred twenty-eight".