681921096 has 64 divisors (see below), whose sum is σ = 1797470400. Its totient is φ = 214990848.

The previous prime is 681921091. The next prime is 681921101. The reversal of 681921096 is 690129186.

It is an interprime number because it is at equal distance from previous prime (681921091) and next prime (681921101).

It is not an unprimeable number, because it can be changed into a prime (681921091) 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 15 ways as a sum of consecutive naturals, for example, 525120 + ... + 526416.

It is an arithmetic number, because the mean of its divisors is an integer number (28085475).

Almost surely, 2^681921096 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 681921096, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (898735200).

681921096 is an abundant number, since it is smaller than the sum of its proper divisors (1115549304).

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

681921096 is a wasteful number, since it uses less digits than its factorization.

681921096 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2478 (or 2474 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 42.

The square root of 681921096 is about 26113.6189755461. The cubic root of 681921096 is about 880.1932667800.

The spelling of 681921096 in words is "six hundred eighty-one million, nine hundred twenty-one thousand, ninety-six".