28448222 has 16 divisors (see below), whose sum is σ = 46911744. Its totient is φ = 12831000.

The previous prime is 28448213. The next prime is 28448261. The reversal of 28448222 is 22284482.

It is a happy number.

It is a super-2 number, since 2×28448222² = 1618602669922568, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 2054 + ... + 7817.

It is an arithmetic number, because the mean of its divisors is an integer number (2931984).

Almost surely, 2^28448222 is an apocalyptic number.

28448222 is a gapful number since it is divisible by the number (22) formed by its first and last digit.

28448222 is a deficient number, since it is larger than the sum of its proper divisors (18463522).

28448222 is a wasteful number, since it uses less digits than its factorization.

28448222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10015.

The product of its digits is 16384, while the sum is 32.

The square root of 28448222 is about 5333.6874674094. The cubic root of 28448222 is about 305.2706439420.

The spelling of 28448222 in words is "twenty-eight million, four hundred forty-eight thousand, two hundred twenty-two".