99866128 has 40 divisors (see below), whose sum is σ = 210264320. Its totient is φ = 45774720.

The previous prime is 99866077. The next prime is 99866141. The reversal of 99866128 is 82166899.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4126 + ... + 14722.

It is an arithmetic number, because the mean of its divisors is an integer number (5256608).

Almost surely, 2^99866128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99866128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (105132160).

99866128 is an abundant number, since it is smaller than the sum of its proper divisors (110398192).

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

99866128 is a wasteful number, since it uses less digits than its factorization.

99866128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10655 (or 10649 counting only the distinct ones).

The product of its digits is 373248, while the sum is 49.

The square root of 99866128 is about 9993.3041582852. The cubic root of 99866128 is about 463.9516646043.

The spelling of 99866128 in words is "ninety-nine million, eight hundred sixty-six thousand, one hundred twenty-eight".