99999856 has 40 divisors (see below), whose sum is σ = 212379264. Its totient is φ = 45236160.

The previous prime is 99999847. The next prime is 99999931. The reversal of 99999856 is 65899999.

It is a congruent 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, 38701 + ... + 41203.

Almost surely, 2^99999856 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 99999856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (106189632).

99999856 is an abundant number, since it is smaller than the sum of its proper divisors (112379408).

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

99999856 is a wasteful number, since it uses less digits than its factorization.

99999856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2749 (or 2743 counting only the distinct ones).

The product of its digits is 14171760, while the sum is 64.

The square root of 99999856 is about 9999.9927999974. The cubic root of 99999856 is about 464.1586605649.

The spelling of 99999856 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred fifty-six".