28211272 has 16 divisors (see below), whose sum is σ = 53314560. Its totient is φ = 13994064.

The previous prime is 28211237. The next prime is 28211291. The reversal of 28211272 is 27211282.

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, 12868 + ... + 14899.

It is an arithmetic number, because the mean of its divisors is an integer number (3332160).

Almost surely, 2^28211272 is an apocalyptic number.

It is an amenable number.

28211272 is a deficient number, since it is larger than the sum of its proper divisors (25103288).

28211272 is a wasteful number, since it uses less digits than its factorization.

28211272 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27900 (or 27896 counting only the distinct ones).

The product of its digits is 896, while the sum is 25.

The square root of 28211272 is about 5311.4284331054. The cubic root of 28211272 is about 304.4207297768.

The spelling of 28211272 in words is "twenty-eight million, two hundred eleven thousand, two hundred seventy-two".