28227897 has 6 divisors (see below), whose sum is σ = 40773642. Its totient is φ = 18818592.

The previous prime is 28227893. The next prime is 28227907. The reversal of 28227897 is 79872282.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 28132416 + 95481 = 5304^2 + 309^2 .

It is not a de Polignac number, because 28227897 - 2² = 28227893 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28227893) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 1568208 + ... + 1568225.

It is an arithmetic number, because the mean of its divisors is an integer number (6795607).

Almost surely, 2^28227897 is an apocalyptic number.

It is an amenable number.

28227897 is a deficient number, since it is larger than the sum of its proper divisors (12545745).

28227897 is a wasteful number, since it uses less digits than its factorization.

28227897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3136439 (or 3136436 counting only the distinct ones).

The product of its digits is 225792, while the sum is 45.

The square root of 28227897 is about 5312.9932241628. The cubic root of 28227897 is about 304.4805167632.

The spelling of 28227897 in words is "twenty-eight million, two hundred twenty-seven thousand, eight hundred ninety-seven".