681583392 has 144 divisors (see below), whose sum is σ = 2257295040. Its totient is φ = 191033856.

The previous prime is 681583387. The next prime is 681583393. The reversal of 681583392 is 293385186.

It is a happy number.

681583392 is a `hidden beast` number, since 68 + 1 + 583 + 3 + 9 + 2 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681583393) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 103659 + ... + 110037.

It is an arithmetic number, because the mean of its divisors is an integer number (15675660).

Almost surely, 2^681583392 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 681583392, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1128647520).

681583392 is an abundant number, since it is smaller than the sum of its proper divisors (1575711648).

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

681583392 is a wasteful number, since it uses less digits than its factorization.

681583392 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6455 (or 6444 counting only the distinct ones).

The product of its digits is 311040, while the sum is 45.

The square root of 681583392 is about 26107.1521235082. The cubic root of 681583392 is about 880.0479450462.

The spelling of 681583392 in words is "six hundred eighty-one million, five hundred eighty-three thousand, three hundred ninety-two".