28190005 has 8 divisors (see below), whose sum is σ = 34919424. Its totient is φ = 21824400.

The previous prime is 28189981. The next prime is 28190017. The reversal of 28190005 is 50009182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28190005 - 2⁷ = 28189877 is a prime.

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 7 ways as a sum of consecutive naturals, for example, 90781 + ... + 91090.

It is an arithmetic number, because the mean of its divisors is an integer number (4364928).

Almost surely, 2^28190005 is an apocalyptic number.

It is an amenable number.

28190005 is a deficient number, since it is larger than the sum of its proper divisors (6729419).

28190005 is a wasteful number, since it uses less digits than its factorization.

28190005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 181907.

The product of its (nonzero) digits is 720, while the sum is 25.

The square root of 28190005 is about 5309.4260518440. The cubic root of 28190005 is about 304.3442149335.

Adding to 28190005 its reverse (50009182), we get a palindrome (78199187).

The spelling of 28190005 in words is "twenty-eight million, one hundred ninety thousand, five".