681946908 has 24 divisors (see below), whose sum is σ = 1684810512. Its totient is φ = 213944064.

The previous prime is 681946907. The next prime is 681946913. The reversal of 681946908 is 809649186.

It is a happy number.

681946908 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681946901) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1671235 + ... + 1671642.

It is an arithmetic number, because the mean of its divisors is an integer number (70200438).

Almost surely, 2^681946908 is an apocalyptic number.

681946908 is a gapful number since it is divisible by the number (68) formed by its first and last digit.

It is an amenable number.

681946908 is an abundant number, since it is smaller than the sum of its proper divisors (1002863604).

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

681946908 is a wasteful number, since it uses less digits than its factorization.

681946908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3342901 (or 3342899 counting only the distinct ones).

The product of its (nonzero) digits is 746496, while the sum is 51.

The square root of 681946908 is about 26114.1131957415. The cubic root of 681946908 is about 880.2043722985.

The spelling of 681946908 in words is "six hundred eighty-one million, nine hundred forty-six thousand, nine hundred eight".