28271172 has 24 divisors (see below), whose sum is σ = 68241600. Its totient is φ = 9098656.

The previous prime is 28271137. The next prime is 28271179. The reversal of 28271172 is 27117282.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (28271179) 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, 40272 + ... + 40967.

It is an arithmetic number, because the mean of its divisors is an integer number (2843400).

Almost surely, 2^28271172 is an apocalyptic number.

It is an amenable number.

28271172 is an abundant number, since it is smaller than the sum of its proper divisors (39970428).

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

28271172 is a wasteful number, since it uses less digits than its factorization.

28271172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81275 (or 81273 counting only the distinct ones).

The product of its digits is 3136, while the sum is 30.

The square root of 28271172 is about 5317.0642275602. The cubic root of 28271172 is about 304.6360327374.

The spelling of 28271172 in words is "twenty-eight million, two hundred seventy-one thousand, one hundred seventy-two".