28005895 has 8 divisors (see below), whose sum is σ = 34032960. Its totient is φ = 22120800.

The previous prime is 28005877. The next prime is 28005907. The reversal of 28005895 is 59850082.

It is a happy number.

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

It is not a de Polignac number, because 28005895 - 2⁷ = 28005767 is a prime.

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, 35056 + ... + 35845.

It is an arithmetic number, because the mean of its divisors is an integer number (4254120).

Almost surely, 2^28005895 is an apocalyptic number.

28005895 is a deficient number, since it is larger than the sum of its proper divisors (6027065).

28005895 is an equidigital number, since it uses as much as digits as its factorization.

28005895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70985.

The product of its (nonzero) digits is 28800, while the sum is 37.

The square root of 28005895 is about 5292.0596179559. The cubic root of 28005895 is about 303.6802060398.

It can be divided in two parts, 28005 and 895, that added together give a square (28900 = 170²).

The spelling of 28005895 in words is "twenty-eight million, five thousand, eight hundred ninety-five".