681592842 has 72 divisors (see below), whose sum is σ = 1723269600. Its totient is φ = 194131728.

The previous prime is 681592837. The next prime is 681592843. The reversal of 681592842 is 248295186.

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 not an unprimeable number, because it can be changed into a prime (681592843) by changing a digit.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 333259 + ... + 335297.

It is an arithmetic number, because the mean of its divisors is an integer number (23934300).

Almost surely, 2^681592842 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681592842, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (861634800).

681592842 is an abundant number, since it is smaller than the sum of its proper divisors (1041676758).

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

681592842 is a wasteful number, since it uses less digits than its factorization.

681592842 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2440 (or 2430 counting only the distinct ones).

The product of its digits is 276480, while the sum is 45.

The square root of 681592842 is about 26107.3331077688. Note that the first 3 decimals coincide. The cubic root of 681592842 is about 880.0520122495.

The spelling of 681592842 in words is "six hundred eighty-one million, five hundred ninety-two thousand, eight hundred forty-two".