28232226 has 48 divisors (see below), whose sum is σ = 69215328. Its totient is φ = 8553600.

The previous prime is 28232213. The next prime is 28232249. The reversal of 28232226 is 62223282.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28232226.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2706 + ... + 7986.

It is an arithmetic number, because the mean of its divisors is an integer number (1441986).

Almost surely, 2^28232226 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28232226, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34607664).

28232226 is an abundant number, since it is smaller than the sum of its proper divisors (40983102).

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

28232226 is a wasteful number, since it uses less digits than its factorization.

28232226 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5309 (or 5297 counting only the distinct ones).

The product of its digits is 4608, while the sum is 27.

The square root of 28232226 is about 5313.4006060149. The cubic root of 28232226 is about 304.4960809027.

The spelling of 28232226 in words is "twenty-eight million, two hundred thirty-two thousand, two hundred twenty-six".