28291255 has 4 divisors (see below), whose sum is σ = 33949512. Its totient is φ = 22633000.

The previous prime is 28291253. The next prime is 28291259. The reversal of 28291255 is 55219282.

It is a happy number.

28291255 is nontrivially palindromic in base 13.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 28291255 - 2¹ = 28291253 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28291255.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28291253) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2829121 + ... + 2829130.

It is an arithmetic number, because the mean of its divisors is an integer number (8487378).

Almost surely, 2^28291255 is an apocalyptic number.

28291255 is a deficient number, since it is larger than the sum of its proper divisors (5658257).

28291255 is an equidigital number, since it uses as much as digits as its factorization.

28291255 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5658256.

The product of its digits is 14400, while the sum is 34.

The square root of 28291255 is about 5318.9524344555. The cubic root of 28291255 is about 304.7081504566.

The spelling of 28291255 in words is "twenty-eight million, two hundred ninety-one thousand, two hundred fifty-five".