99816840 has 128 divisors (see below), whose sum is σ = 344304000. Its totient is φ = 25691904.

The previous prime is 99816839. The next prime is 99816853. The reversal of 99816840 is 4861899.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 29727 + ... + 32913.

It is an arithmetic number, because the mean of its divisors is an integer number (2689875).

Almost surely, 2^99816840 is an apocalyptic number.

99816840 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 99816840, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (172152000).

99816840 is an abundant number, since it is smaller than the sum of its proper divisors (244487160).

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

99816840 is a wasteful number, since it uses less digits than its factorization.

99816840 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3236 (or 3226 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 45.

The square root of 99816840 is about 9990.8378027070. The cubic root of 99816840 is about 463.8753256991.

The spelling of 99816840 in words is "ninety-nine million, eight hundred sixteen thousand, eight hundred forty".