28118388 has 24 divisors (see below), whose sum is σ = 67136608. Its totient is φ = 9154656.

The previous prime is 28118383. The next prime is 28118399. The reversal of 28118388 is 88381182.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28118383) 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 7 ways as a sum of consecutive naturals, for example, 26731 + ... + 27762.

Almost surely, 2^28118388 is an apocalyptic number.

It is an amenable number.

28118388 is an abundant number, since it is smaller than the sum of its proper divisors (39018220).

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

28118388 is a wasteful number, since it uses less digits than its factorization.

28118388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54543 (or 54541 counting only the distinct ones).

The product of its digits is 24576, while the sum is 39.

The square root of 28118388 is about 5302.6774369181. The cubic root of 28118388 is about 304.0862664919.

The spelling of 28118388 in words is "twenty-eight million, one hundred eighteen thousand, three hundred eighty-eight".