28227845 has 4 divisors (see below), whose sum is σ = 33873420. Its totient is φ = 22582272.

The previous prime is 28227841. The next prime is 28227847. The reversal of 28227845 is 54872282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 54872282 = 2 ⋅27436141.

It can be written as a sum of positive squares in 2 ways, for example, as 17032129 + 11195716 = 4127^2 + 3346^2 .

It is a cyclic number.

It is not a de Polignac number, because 28227845 - 2² = 28227841 is a prime.

It is a super-2 number, since 2×28227845² = 1593622466688050, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 28227799 and 28227808.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28227841) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2822780 + ... + 2822789.

It is an arithmetic number, because the mean of its divisors is an integer number (8468355).

Almost surely, 2^28227845 is an apocalyptic number.

It is an amenable number.

28227845 is a deficient number, since it is larger than the sum of its proper divisors (5645575).

28227845 is an equidigital number, since it uses as much as digits as its factorization.

28227845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5645574.

The product of its digits is 71680, while the sum is 38.

The square root of 28227845 is about 5312.9883304973. The cubic root of 28227845 is about 304.4803297969.

The spelling of 28227845 in words is "twenty-eight million, two hundred twenty-seven thousand, eight hundred forty-five".