28279893 has 4 divisors (see below), whose sum is σ = 37706528. Its totient is φ = 18853260.

The previous prime is 28279871. The next prime is 28279913. The reversal of 28279893 is 39897282.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 28279893 - 2⁵ = 28279861 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 (28279813) by changing a digit.

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, 4713313 + ... + 4713318.

It is an arithmetic number, because the mean of its divisors is an integer number (9426632).

Almost surely, 2^28279893 is an apocalyptic number.

It is an amenable number.

28279893 is a deficient number, since it is larger than the sum of its proper divisors (9426635).

28279893 is an equidigital number, since it uses as much as digits as its factorization.

28279893 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9426634.

The product of its digits is 435456, while the sum is 48.

The square root of 28279893 is about 5317.8842597409. The cubic root of 28279893 is about 304.6673538974.

It can be divided in two parts, 2827 and 9893, that added together give a triangular number (12720 = T₁₅₉).

The spelling of 28279893 in words is "twenty-eight million, two hundred seventy-nine thousand, eight hundred ninety-three".