28681255 has 4 divisors (see below), whose sum is σ = 34417512. Its totient is φ = 22945000.

The previous prime is 28681217. The next prime is 28681283. The reversal of 28681255 is 55218682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55218682 = 2 ⋅27609341.

It is not a de Polignac number, because 28681255 - 2¹¹ = 28679207 is a prime.

It is a super-2 number, since 2×28681255² = 1645228776750050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 2868121 + ... + 2868130.

It is an arithmetic number, because the mean of its divisors is an integer number (8604378).

Almost surely, 2^28681255 is an apocalyptic number.

28681255 is a deficient number, since it is larger than the sum of its proper divisors (5736257).

28681255 is an equidigital number, since it uses as much as digits as its factorization.

28681255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5736256.

The product of its digits is 38400, while the sum is 37.

The square root of 28681255 is about 5355.4883064012. The cubic root of 28681255 is about 306.1019175798.

The spelling of 28681255 in words is "twenty-eight million, six hundred eighty-one thousand, two hundred fifty-five".