681894192 has 120 divisors (see below), whose sum is σ = 2157153600. Its totient is φ = 184560768.

The previous prime is 681894163. The next prime is 681894193. The reversal of 681894192 is 291498186.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is not an unprimeable number, because it can be changed into a prime (681894193) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 37059 + ... + 52317.

It is an arithmetic number, because the mean of its divisors is an integer number (17976280).

Almost surely, 2^681894192 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 681894192, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1078576800).

681894192 is an abundant number, since it is smaller than the sum of its proper divisors (1475259408).

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

681894192 is a wasteful number, since it uses less digits than its factorization.

681894192 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15303 (or 15290 counting only the distinct ones).

The product of its digits is 248832, while the sum is 48.

The square root of 681894192 is about 26113.1038369628. The cubic root of 681894192 is about 880.1816911343.

The spelling of 681894192 in words is "six hundred eighty-one million, eight hundred ninety-four thousand, one hundred ninety-two".