28185522 has 8 divisors (see below), whose sum is σ = 56371056. Its totient is φ = 9395172.

The previous prime is 28185503. The next prime is 28185523. The reversal of 28185522 is 22558182.

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

28185522 is an admirable number.

It is not an unprimeable number, because it can be changed into a prime (28185523) 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, 2348788 + ... + 2348799.

It is an arithmetic number, because the mean of its divisors is an integer number (7046382).

Almost surely, 2^28185522 is an apocalyptic number.

28185522 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.

28185522 is a wasteful number, since it uses less digits than its factorization.

28185522 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4697592.

The product of its digits is 12800, while the sum is 33.

The square root of 28185522 is about 5309.0038613661. The cubic root of 28185522 is about 304.3280809947.

The spelling of 28185522 in words is "twenty-eight million, one hundred eighty-five thousand, five hundred twenty-two".