99891816 has 64 divisors (see below), whose sum is σ = 264000000. Its totient is φ = 31409856.

The previous prime is 99891811. The next prime is 99891821. The reversal of 99891816 is 61819899.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (99891811) and next prime (99891821).

It is not an unprimeable number, because it can be changed into a prime (99891811) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 199935 + ... + 200433.

It is an arithmetic number, because the mean of its divisors is an integer number (4125000).

Almost surely, 2^99891816 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 99891816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (132000000).

99891816 is an abundant number, since it is smaller than the sum of its proper divisors (164108184).

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

99891816 is a wasteful number, since it uses less digits than its factorization.

99891816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 966 (or 962 counting only the distinct ones).

The product of its digits is 279936, while the sum is 51.

The square root of 99891816 is about 9994.5893362359. The cubic root of 99891816 is about 463.9914410827.

The spelling of 99891816 in words is "ninety-nine million, eight hundred ninety-one thousand, eight hundred sixteen".