681851376 has 90 divisors (see below), whose sum is σ = 1995033768. Its totient is φ = 217377600.

The previous prime is 681851371. The next prime is 681851381. The reversal of 681851376 is 673158186.

681851376 is a `hidden beast` number, since 68 + 1 + 8 + 513 + 76 = 666.

It is an interprime number because it is at equal distance from previous prime (681851371) and next prime (681851381).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681851371) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 71701 + ... + 80651.

Almost surely, 2^681851376 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 681851376, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (997516884).

681851376 is an abundant number, since it is smaller than the sum of its proper divisors (1313182392).

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

681851376 is a wasteful number, since it uses less digits than its factorization.

681851376 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9011 (or 8979 counting only the distinct ones).

The product of its digits is 241920, while the sum is 45.

The square root of 681851376 is about 26112.2840058085. The cubic root of 681851376 is about 880.1632686046.

The spelling of 681851376 in words is "six hundred eighty-one million, eight hundred fifty-one thousand, three hundred seventy-six".