28289118 has 32 divisors (see below), whose sum is σ = 66471552. Its totient is φ = 7912800.

The previous prime is 28289117. The next prime is 28289137. The reversal of 28289118 is 81198282.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28289117) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15628 + ... + 17343.

It is an arithmetic number, because the mean of its divisors is an integer number (2077236).

Almost surely, 2^28289118 is an apocalyptic number.

28289118 is an abundant number, since it is smaller than the sum of its proper divisors (38182434).

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

28289118 is a wasteful number, since it uses less digits than its factorization.

28289118 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33000.

The product of its digits is 18432, while the sum is 39.

The square root of 28289118 is about 5318.7515452407. The cubic root of 28289118 is about 304.7004781480.

The spelling of 28289118 in words is "twenty-eight million, two hundred eighty-nine thousand, one hundred eighteen".