99873218 has 4 divisors (see below), whose sum is σ = 149809830. Its totient is φ = 49936608.

The previous prime is 99873217. The next prime is 99873223. The reversal of 99873218 is 81237899.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 87853129 + 12020089 = 9373^2 + 3467^2 .

It is not an unprimeable number, because it can be changed into a prime (99873217) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 24968303 + ... + 24968306.

Almost surely, 2^99873218 is an apocalyptic number.

99873218 is a deficient number, since it is larger than the sum of its proper divisors (49936612).

99873218 is a wasteful number, since it uses less digits than its factorization.

99873218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 49936611.

The product of its digits is 217728, while the sum is 47.

The square root of 99873218 is about 9993.6588895159. The cubic root of 99873218 is about 463.9626437672.

The spelling of 99873218 in words is "ninety-nine million, eight hundred seventy-three thousand, two hundred eighteen".