28225847 has 4 divisors (see below), whose sum is σ = 30397080. Its totient is φ = 26054616.

The previous prime is 28225843. The next prime is 28225867. The reversal of 28225847 is 74852282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28225847 - 2² = 28225843 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28225847.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28225843) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1085597 + ... + 1085622.

It is an arithmetic number, because the mean of its divisors is an integer number (7599270).

Almost surely, 2^28225847 is an apocalyptic number.

28225847 is a deficient number, since it is larger than the sum of its proper divisors (2171233).

28225847 is a wasteful number, since it uses less digits than its factorization.

28225847 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2171232.

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

The square root of 28225847 is about 5312.8002973950. The cubic root of 28225847 is about 304.4731458024.

The spelling of 28225847 in words is "twenty-eight million, two hundred twenty-five thousand, eight hundred forty-seven".