99871800 has 288 divisors, whose sum is σ = 373190400. Its totient is φ = 22014720.

The previous prime is 99871789. The next prime is 99871813. The reversal of 99871800 is 817899.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 1264161 + ... + 1264239.

It is an arithmetic number, because the mean of its divisors is an integer number (1295800).

Almost surely, 2^99871800 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 99871800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186595200).

99871800 is an abundant number, since it is smaller than the sum of its proper divisors (273318600).

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

99871800 is a wasteful number, since it uses less digits than its factorization.

99871800 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 155 (or 139 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 42.

The square root of 99871800 is about 9993.5879442771. The cubic root of 99871800 is about 463.9604479762.

The spelling of 99871800 in words is "ninety-nine million, eight hundred seventy-one thousand, eight hundred".