28228272 has 40 divisors (see below), whose sum is σ = 73328640. Its totient is φ = 9357120.

The previous prime is 28228271. The next prime is 28228289. The reversal of 28228272 is 27282282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28228271) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7629 + ... + 10707.

It is an arithmetic number, because the mean of its divisors is an integer number (1833216).

Almost surely, 2^28228272 is an apocalyptic number.

It is an amenable number.

28228272 is an abundant number, since it is smaller than the sum of its proper divisors (45100368).

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

28228272 is a wasteful number, since it uses less digits than its factorization.

28228272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3281 (or 3275 counting only the distinct ones).

The product of its digits is 14336, while the sum is 33.

The square root of 28228272 is about 5313.0285148868. The cubic root of 28228272 is about 304.4818650711.

The spelling of 28228272 in words is "twenty-eight million, two hundred twenty-eight thousand, two hundred seventy-two".