681563802 has 8 divisors (see below), whose sum is σ = 1363127616. Its totient is φ = 227187932.

The previous prime is 681563783. The next prime is 681563809. The reversal of 681563802 is 208365186.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

681563802 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (681563809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 56796978 + ... + 56796989.

It is an arithmetic number, because the mean of its divisors is an integer number (170390952).

Almost surely, 2^681563802 is an apocalyptic number.

681563802 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

681563802 is a wasteful number, since it uses less digits than its factorization.

681563802 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 113593972.

The product of its (nonzero) digits is 69120, while the sum is 39.

The square root of 681563802 is about 26106.7769362670. The cubic root of 681563802 is about 880.0395135494.

The spelling of 681563802 in words is "six hundred eighty-one million, five hundred sixty-three thousand, eight hundred two".