28725222 has 8 divisors (see below), whose sum is σ = 57450456. Its totient is φ = 9575072.

The previous prime is 28725199. The next prime is 28725227. The reversal of 28725222 is 22252782.

It is a sphenic number, since it is the product of 3 distinct primes.

28725222 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 28725222.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28725227) 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, 2393763 + ... + 2393774.

It is an arithmetic number, because the mean of its divisors is an integer number (7181307).

Almost surely, 2^28725222 is an apocalyptic number.

28725222 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

28725222 is a wasteful number, since it uses less digits than its factorization.

28725222 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4787542.

The product of its digits is 8960, while the sum is 30.

The square root of 28725222 is about 5359.5915889179. The cubic root of 28725222 is about 306.2582509508.

The spelling of 28725222 in words is "twenty-eight million, seven hundred twenty-five thousand, two hundred twenty-two".