28287438 has 16 divisors (see below), whose sum is σ = 58400256. Its totient is φ = 9124920.

The previous prime is 28287437. The next prime is 28287463. The reversal of 28287438 is 83478282.

It is a self number, because there is not a number n which added to its sum of digits gives 28287438.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28287433) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75856 + ... + 76227.

It is an arithmetic number, because the mean of its divisors is an integer number (3650016).

Almost surely, 2^28287438 is an apocalyptic number.

28287438 is an abundant number, since it is smaller than the sum of its proper divisors (30112818).

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

28287438 is a wasteful number, since it uses less digits than its factorization.

28287438 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152119.

The product of its digits is 172032, while the sum is 42.

The square root of 28287438 is about 5318.5936110968. The cubic root of 28287438 is about 304.6944463005.

The spelling of 28287438 in words is "twenty-eight million, two hundred eighty-seven thousand, four hundred thirty-eight".