28489638 has 16 divisors (see below), whose sum is σ = 57081600. Its totient is φ = 9479496.

The previous prime is 28489633. The next prime is 28489639. The reversal of 28489638 is 83698482.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28489631) 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, 370 + ... + 7557.

It is an arithmetic number, because the mean of its divisors is an integer number (3567600).

Almost surely, 2^28489638 is an apocalyptic number.

28489638 is an abundant number, since it is smaller than the sum of its proper divisors (28591962).

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

28489638 is a wasteful number, since it uses less digits than its factorization.

28489638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8531.

The product of its digits is 663552, while the sum is 48.

The square root of 28489638 is about 5337.5685475692. The cubic root of 28489638 is about 305.4187136353.

The spelling of 28489638 in words is "twenty-eight million, four hundred eighty-nine thousand, six hundred thirty-eight".