9999280218 has 16 divisors (see below), whose sum is σ = 21174946560. Its totient is φ = 3137029056.

The previous prime is 9999280217. The next prime is 9999280241. The reversal of 9999280218 is 8120829999.

It is a super-2 number, since 2×9999280218² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (9999280217) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 49015978 + ... + 49016181.

It is an arithmetic number, because the mean of its divisors is an integer number (1323434160).

Almost surely, 2^9999280218 is an apocalyptic number.

9999280218 is an abundant number, since it is smaller than the sum of its proper divisors (11175666342).

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

9999280218 is a wasteful number, since it uses less digits than its factorization.

9999280218 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 98032181.

The product of its (nonzero) digits is 1679616, while the sum is 57.

The square root of 9999280218 is about 99996.4010252369. The cubic root of 9999280218 is about 2154.3829980146.

The spelling of 9999280218 in words is "nine billion, nine hundred ninety-nine million, two hundred eighty thousand, two hundred eighteen".