99845550 has 144 divisors (see below), whose sum is σ = 317435040. Its totient is φ = 22014720.

The previous prime is 99845549. The next prime is 99845561. The reversal of 99845550 is 5554899.

99845550 is a `hidden beast` number, since 9 + 98 + 4 + 5 + 550 = 666.

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

It is a junction number, because it is equal to n+sod(n) for n = 99845496 and 99845505.

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, 90804 + ... + 91896.

It is an arithmetic number, because the mean of its divisors is an integer number (2204410).

Almost surely, 2^99845550 is an apocalyptic number.

99845550 is a gapful number since it is divisible by the number (90) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 99845550, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (158717520).

99845550 is an abundant number, since it is smaller than the sum of its proper divisors (217589490).

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

99845550 is a wasteful number, since it uses less digits than its factorization.

99845550 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1147 (or 1139 counting only the distinct ones).

The product of its (nonzero) digits is 324000, while the sum is 45.

The square root of 99845550 is about 9992.2745158447. The cubic root of 99845550 is about 463.9197957636.

The spelling of 99845550 in words is "ninety-nine million, eight hundred forty-five thousand, five hundred fifty".