28289575 has 12 divisors (see below), whose sum is σ = 36925960. Its totient is φ = 21440160.

The previous prime is 28289561. The next prime is 28289579. The reversal of 28289575 is 57598282.

It is not a de Polignac number, because 28289575 - 2¹¹ = 28287527 is a prime.

It is a hoax number, since the sum of its digits (46) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28289579) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29304 + ... + 30253.

Almost surely, 2^28289575 is an apocalyptic number.

28289575 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

28289575 is a deficient number, since it is larger than the sum of its proper divisors (8636385).

28289575 is a wasteful number, since it uses less digits than its factorization.

28289575 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 59586 (or 59581 counting only the distinct ones).

The product of its digits is 403200, while the sum is 46.

The square root of 28289575 is about 5318.7945062768. The cubic root of 28289575 is about 304.7021189129.

It can be divided in two parts, 2828 and 9575, that added together give a triangular number (12403 = T₁₅₇).

The spelling of 28289575 in words is "twenty-eight million, two hundred eighty-nine thousand, five hundred seventy-five".