99644289 has 8 divisors (see below), whose sum is σ = 133705920. Its totient is φ = 66006096.

The previous prime is 99644267. The next prime is 99644291. The reversal of 99644289 is 98244699.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 99644289 - 2⁷ = 99644161 is a prime.

It is not an unprimeable number, because it can be changed into a prime (99644789) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 105309 + ... + 106250.

It is an arithmetic number, because the mean of its divisors is an integer number (16713240).

Almost surely, 2^99644289 is an apocalyptic number.

It is an amenable number.

99644289 is a deficient number, since it is larger than the sum of its proper divisors (34061631).

99644289 is a wasteful number, since it uses less digits than its factorization.

99644289 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 211719.

The product of its digits is 1119744, while the sum is 51.

The square root of 99644289 is about 9982.1986055177. The cubic root of 99644289 is about 463.6078747760.

The spelling of 99644289 in words is "ninety-nine million, six hundred forty-four thousand, two hundred eighty-nine".