28170117 has 24 divisors (see below), whose sum is σ = 42186144. Its totient is φ = 18101664.

The previous prime is 28170113. The next prime is 28170119. The reversal of 28170117 is 71107182.

It is not a de Polignac number, because 28170117 - 2² = 28170113 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28170113) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 31683 + ... + 32559.

It is an arithmetic number, because the mean of its divisors is an integer number (1757756).

Almost surely, 2^28170117 is an apocalyptic number.

It is an amenable number.

28170117 is a deficient number, since it is larger than the sum of its proper divisors (14016027).

28170117 is a wasteful number, since it uses less digits than its factorization.

28170117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1009 (or 1006 counting only the distinct ones).

The product of its (nonzero) digits is 784, while the sum is 27.

The square root of 28170117 is about 5307.5528259265. The cubic root of 28170117 is about 304.2726266558.

Adding to 28170117 its reverse (71107182), we get a palindrome (99277299).

The spelling of 28170117 in words is "twenty-eight million, one hundred seventy thousand, one hundred seventeen".