28232228 has 12 divisors (see below), whose sum is σ = 49478940. Its totient is φ = 14095392.

The previous prime is 28232213. The next prime is 28232249. The reversal of 28232228 is 82223282.

It can be written as a sum of positive squares in 2 ways, for example, as 27793984 + 438244 = 5272^2 + 662^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28232228.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1883 + ... + 7746.

It is an arithmetic number, because the mean of its divisors is an integer number (4123245).

Almost surely, 2^28232228 is an apocalyptic number.

It is an amenable number.

28232228 is a deficient number, since it is larger than the sum of its proper divisors (21246712).

28232228 is a wasteful number, since it uses less digits than its factorization.

28232228 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10366 (or 10364 counting only the distinct ones).

The product of its digits is 6144, while the sum is 29.

The square root of 28232228 is about 5313.4007942183. The cubic root of 28232228 is about 304.4960880930.

The spelling of 28232228 in words is "twenty-eight million, two hundred thirty-two thousand, two hundred twenty-eight".