100643886 has 48 divisors (see below), whose sum is σ = 250758144. Its totient is φ = 28577232.

The previous prime is 100643843. The next prime is 100643941. The reversal of 100643886 is 688346001.

It is a happy number.

100643886 is a `hidden beast` number, since 1 + 0 + 0 + 643 + 8 + 8 + 6 = 666.

It is a self number, because there is not a number n which added to its sum of digits gives 100643886.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 18651 + ... + 23433.

It is an arithmetic number, because the mean of its divisors is an integer number (5224128).

Almost surely, 2^100643886 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 100643886, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (125379072).

100643886 is an abundant number, since it is smaller than the sum of its proper divisors (150114258).

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

100643886 is a wasteful number, since it uses less digits than its factorization.

100643886 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4965 (or 4962 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 100643886 is about 10032.1426425266. The cubic root of 100643886 is about 465.1529708303.

Adding to 100643886 its reverse (688346001), we get a palindrome (788989887).

The spelling of 100643886 in words is "one hundred million, six hundred forty-three thousand, eight hundred eighty-six".