99818180 has 48 divisors (see below), whose sum is σ = 261346176. Its totient is φ = 31111680.

The previous prime is 99818129. The next prime is 99818189. The reversal of 99818180 is 8181899.

It is a happy number.

It is a Smith number, since the sum of its digits (44) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (44).

It is not an unprimeable number, because it can be changed into a prime (99818189) 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, 30869 + ... + 33948.

It is an arithmetic number, because the mean of its divisors is an integer number (5444712).

Almost surely, 2^99818180 is an apocalyptic number.

It is an amenable number.

99818180 is an abundant number, since it is smaller than the sum of its proper divisors (161527996).

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

99818180 is a wasteful number, since it uses less digits than its factorization.

99818180 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64844 (or 64842 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 44.

The square root of 99818180 is about 9990.9048639250. The cubic root of 99818180 is about 463.8774014683.

It can be divided in two parts, 9 and 9818180, that added together give a palindrome (9818189).

The spelling of 99818180 in words is "ninety-nine million, eight hundred eighteen thousand, one hundred eighty".