681639100 has 36 divisors (see below), whose sum is σ = 1480674328. Its totient is φ = 272376000.

The previous prime is 681639061. The next prime is 681639103. The reversal of 681639100 is 1936186.

681639100 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (681639103) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 114190 + ... + 120010.

Almost surely, 2^681639100 is an apocalyptic number.

It is an amenable number.

681639100 is an abundant number, since it is smaller than the sum of its proper divisors (799035228).

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

681639100 is a wasteful number, since it uses less digits than its factorization.

681639100 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7006 (or 6999 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 681639100 is about 26108.2190124106. The cubic root of 681639100 is about 880.0719207748.

The spelling of 681639100 in words is "six hundred eighty-one million, six hundred thirty-nine thousand, one hundred".