681380808 has 64 divisors (see below), whose sum is σ = 1842082560. Its totient is φ = 209212416.

The previous prime is 681380807. The next prime is 681380813. The reversal of 681380808 is 808083186.

It is a happy number.

It is a self number, because there is not a number n which added to its sum of digits gives 681380808.

It is not an unprimeable number, because it can be changed into a prime (681380803) 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 15 ways as a sum of consecutive naturals, for example, 1410 + ... + 36942.

It is an arithmetic number, because the mean of its divisors is an integer number (28782540).

Almost surely, 2^681380808 is an apocalyptic number.

681380808 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 681380808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (921041280).

681380808 is an abundant number, since it is smaller than the sum of its proper divisors (1160701752).

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

681380808 is a wasteful number, since it uses less digits than its factorization.

681380808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 35606 (or 35602 counting only the distinct ones).

The product of its (nonzero) digits is 73728, while the sum is 42.

The square root of 681380808 is about 26103.2719788152. The cubic root of 681380808 is about 879.9607454942.

The spelling of 681380808 in words is "six hundred eighty-one million, three hundred eighty thousand, eight hundred eight".