16440228 has 36 divisors (see below), whose sum is σ = 47494720. Its totient is φ = 4697136.

The previous prime is 16440223. The next prime is 16440251. The reversal of 16440228 is 82204461.

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

It is a super-3 number, since 3×16440228³ (a number of 23 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (16440223) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 32368 + ... + 32871.

Almost surely, 2^16440228 is an apocalyptic number.

16440228 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

16440228 is an abundant number, since it is smaller than the sum of its proper divisors (31054492).

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

16440228 is a wasteful number, since it uses less digits than its factorization.

16440228 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 65256 (or 65251 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 27.

The square root of 16440228 is about 4054.6551024717. The cubic root of 16440228 is about 254.2743847039.

Adding to 16440228 its reverse (82204461), we get a palindrome (98644689).

The spelling of 16440228 in words is "sixteen million, four hundred forty thousand, two hundred twenty-eight".