18220002228 has 36 divisors (see below), whose sum is σ = 46174548420. Its totient is φ = 6057716736.

The previous prime is 18220002211. The next prime is 18220002233. The reversal of 18220002228 is 82220002281.

It can be written as a sum of positive squares in 2 ways, for example, as 7818450084 + 10401552144 = 88422^2 + 101988^2 .

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 636525 + ... + 664532.

It is an arithmetic number, because the mean of its divisors is an integer number (1282626345).

Almost surely, 2^18220002228 is an apocalyptic number.

18220002228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

18220002228 is an abundant number, since it is smaller than the sum of its proper divisors (27954546192).

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

18220002228 is a wasteful number, since it uses less digits than its factorization.

18220002228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1301456 (or 1301451 counting only the distinct ones).

The product of its (nonzero) digits is 2048, while the sum is 27.

The spelling of 18220002228 in words is "eighteen billion, two hundred twenty million, two thousand, two hundred twenty-eight".