681395800 has 24 divisors (see below), whose sum is σ = 1584245700. Its totient is φ = 272558240.

The previous prime is 681395789. The next prime is 681395807. The reversal of 681395800 is 8593186.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681395807) 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 5 ways as a sum of consecutive naturals, for example, 1703290 + ... + 1703689.

Almost surely, 2^681395800 is an apocalyptic number.

It is an amenable number.

681395800 is an abundant number, since it is smaller than the sum of its proper divisors (902849900).

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

681395800 is a wasteful number, since it uses less digits than its factorization.

681395800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3406995 (or 3406986 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 40.

The square root of 681395800 is about 26103.5591443006. The cubic root of 681395800 is about 879.9671991906.

The spelling of 681395800 in words is "six hundred eighty-one million, three hundred ninety-five thousand, eight hundred".