99138228 has 48 divisors (see below), whose sum is σ = 270004224. Its totient is φ = 27721440.

The previous prime is 99138227. The next prime is 99138229. The reversal of 99138228 is 82283199.

It is an interprime number because it is at equal distance from previous prime (99138227) and next prime (99138229).

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

It is a self number, because there is not a number n which added to its sum of digits gives 99138228.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (99138227) 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, 8608 + ... + 16503.

It is an arithmetic number, because the mean of its divisors is an integer number (5625088).

Almost surely, 2^99138228 is an apocalyptic number.

It is an amenable number.

99138228 is an abundant number, since it is smaller than the sum of its proper divisors (170865996).

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

99138228 is a wasteful number, since it uses less digits than its factorization.

99138228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25172 (or 25170 counting only the distinct ones).

The product of its digits is 62208, while the sum is 42.

The square root of 99138228 is about 9956.8181664626. The cubic root of 99138228 is about 462.8217043980.

The spelling of 99138228 in words is "ninety-nine million, one hundred thirty-eight thousand, two hundred twenty-eight".