28117903 has 8 divisors (see below), whose sum is σ = 30946896. Its totient is φ = 25334400.

The previous prime is 28117897. The next prime is 28117913. The reversal of 28117903 is 30971182.

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

It is a cyclic number.

It is not a de Polignac number, because 28117903 - 2⁵ = 28117871 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 (28117913) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10068 + ... + 12553.

It is an arithmetic number, because the mean of its divisors is an integer number (3868362).

Almost surely, 2^28117903 is an apocalyptic number.

28117903 is a deficient number, since it is larger than the sum of its proper divisors (2828993).

28117903 is a wasteful number, since it uses less digits than its factorization.

28117903 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22745.

The product of its (nonzero) digits is 3024, while the sum is 31.

The square root of 28117903 is about 5302.6317051064. The cubic root of 28117903 is about 304.0845181379.

The spelling of 28117903 in words is "twenty-eight million, one hundred seventeen thousand, nine hundred three".