28259005 has 4 divisors (see below), whose sum is σ = 33910812. Its totient is φ = 22607200.

The previous prime is 28258999. The next prime is 28259027. The reversal of 28259005 is 50095282.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 12243001 + 16016004 = 3499^2 + 4002^2 .

It is not a de Polignac number, because 28259005 - 2⁹ = 28258493 is a prime.

It is a Smith number, since the sum of its digits (31) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2825896 + ... + 2825905.

It is an arithmetic number, because the mean of its divisors is an integer number (8477703).

Almost surely, 2^28259005 is an apocalyptic number.

It is an amenable number.

28259005 is a deficient number, since it is larger than the sum of its proper divisors (5651807).

28259005 is an equidigital number, since it uses as much as digits as its factorization.

28259005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5651806.

The product of its (nonzero) digits is 7200, while the sum is 31.

The square root of 28259005 is about 5315.9199580129. The cubic root of 28259005 is about 304.5923246277.

The spelling of 28259005 in words is "twenty-eight million, two hundred fifty-nine thousand, five".