681892488 has 48 divisors (see below), whose sum is σ = 1881647820. Its totient is φ = 223007616.

The previous prime is 681892483. The next prime is 681892507. The reversal of 681892488 is 884298186.

681892488 is a `hidden beast` number, since 6 + 81 + 89 + 2 + 488 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 598389444 + 83503044 = 24462^2 + 9138^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (681892483) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 85531 + ... + 93162.

Almost surely, 2^681892488 is an apocalyptic number.

It is an amenable number.

681892488 is an abundant number, since it is smaller than the sum of its proper divisors (1199755332).

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

681892488 is a wasteful number, since it uses less digits than its factorization.

681892488 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 178758 (or 178751 counting only the distinct ones).

The product of its digits is 1769472, while the sum is 54.

The square root of 681892488 is about 26113.0712096452. The cubic root of 681892488 is about 880.1809579654.

The spelling of 681892488 in words is "six hundred eighty-one million, eight hundred ninety-two thousand, four hundred eighty-eight".