28022225 has 24 divisors (see below), whose sum is σ = 43324608. Its totient is φ = 17467200.

The previous prime is 28022221. The next prime is 28022231. The reversal of 28022225 is 52222082.

It is a happy number.

It is not a de Polignac number, because 28022225 - 2² = 28022221 is a prime.

It is a Duffinian number.

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 28022225.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28022221) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5354 + ... + 9203.

It is an arithmetic number, because the mean of its divisors is an integer number (1805192).

Almost surely, 2^28022225 is an apocalyptic number.

28022225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

28022225 is a deficient number, since it is larger than the sum of its proper divisors (15302383).

28022225 is a wasteful number, since it uses less digits than its factorization.

28022225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14585 (or 14580 counting only the distinct ones).

The product of its (nonzero) digits is 1280, while the sum is 23.

The square root of 28022225 is about 5293.6022706660. The cubic root of 28022225 is about 303.7392190227.

The spelling of 28022225 in words is "twenty-eight million, twenty-two thousand, two hundred twenty-five".