28490855 has 4 divisors (see below), whose sum is σ = 34189032. Its totient is φ = 22792680.

The previous prime is 28490849. The next prime is 28490857. The reversal of 28490855 is 55809482.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 55809482 = 2 ⋅27904741.

It is not a de Polignac number, because 28490855 - 2¹⁰ = 28489831 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28490857) 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, 2849081 + ... + 2849090.

It is an arithmetic number, because the mean of its divisors is an integer number (8547258).

Almost surely, 2^28490855 is an apocalyptic number.

28490855 is a deficient number, since it is larger than the sum of its proper divisors (5698177).

28490855 is an equidigital number, since it uses as much as digits as its factorization.

28490855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5698176.

The product of its (nonzero) digits is 115200, while the sum is 41.

The square root of 28490855 is about 5337.6825495715. The cubic root of 28490855 is about 305.4230624595.

The spelling of 28490855 in words is "twenty-eight million, four hundred ninety thousand, eight hundred fifty-five".