681869100 has 72 divisors (see below), whose sum is σ = 2152237248. Its totient is φ = 165300800.

The previous prime is 681869047. The next prime is 681869101. The reversal of 681869100 is 1968186.

681869100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (681869101) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 100014 + ... + 106613.

It is an arithmetic number, because the mean of its divisors is an integer number (29892184).

Almost surely, 2^681869100 is an apocalyptic number.

681869100 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

681869100 is an abundant number, since it is smaller than the sum of its proper divisors (1470368148).

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

681869100 is a wasteful number, since it uses less digits than its factorization.

681869100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 206655 (or 206648 counting only the distinct ones).

The product of its (nonzero) digits is 20736, while the sum is 39.

The square root of 681869100 is about 26112.6233841029. The cubic root of 681869100 is about 880.1708948406.

The spelling of 681869100 in words is "six hundred eighty-one million, eight hundred sixty-nine thousand, one hundred".