28117895 has 16 divisors (see below), whose sum is σ = 36705312. Its totient is φ = 20553600.

The previous prime is 28117877. The next prime is 28117897. The reversal of 28117895 is 59871182.

It is not a de Polignac number, because 28117895 - 2²² = 23923591 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 (28117897) 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 15 ways as a sum of consecutive naturals, for example, 4424 + ... + 8706.

It is an arithmetic number, because the mean of its divisors is an integer number (2294082).

Almost surely, 2^28117895 is an apocalyptic number.

28117895 is a deficient number, since it is larger than the sum of its proper divisors (8587417).

28117895 is a wasteful number, since it uses less digits than its factorization.

28117895 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4402.

The product of its digits is 40320, while the sum is 41.

The square root of 28117895 is about 5302.6309507640. The cubic root of 28117895 is about 304.0844892989.

The spelling of 28117895 in words is "twenty-eight million, one hundred seventeen thousand, eight hundred ninety-five".