681838592 has 36 divisors (see below), whose sum is σ = 1365711165. Its totient is φ = 340328448.

The previous prime is 681838589. The next prime is 681838607. The reversal of 681838592 is 295838186.

It is a powerful number, because all its prime factors have an exponent greater than 1 and also an Achilles number because it is not a perfect power.

It can be written as a sum of positive squares in 2 ways, for example, as 397444096 + 284394496 = 19936^2 + 16864^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=18464.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 681838592.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 1181408 + ... + 1181984.

Almost surely, 2^681838592 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 681838592

681838592 is an abundant number, since it is smaller than the sum of its proper divisors (683872573).

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

681838592 is an frugal number, since it uses more digits than its factorization.

681838592 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1176 (or 579 counting only the distinct ones).

The product of its digits is 829440, while the sum is 50.

The square root of 681838592 is about 26112.0392156568. The cubic root of 681838592 is about 880.1577678567.

Multiplying 681838592 by its sum of digits (50), we get a square (34091929600 = 184640²).

The spelling of 681838592 in words is "six hundred eighty-one million, eight hundred thirty-eight thousand, five hundred ninety-two".