28243117 has 16 divisors (see below), whose sum is σ = 33125760. Its totient is φ = 23579712.

The previous prime is 28243109. The next prime is 28243133. The reversal of 28243117 is 71134282.

It is a cyclic number.

It is not a de Polignac number, because 28243117 - 2³ = 28243109 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 (28243417) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 99658 + ... + 99940.

It is an arithmetic number, because the mean of its divisors is an integer number (2070360).

Almost surely, 2^28243117 is an apocalyptic number.

It is an amenable number.

28243117 is a deficient number, since it is larger than the sum of its proper divisors (4882643).

28243117 is a wasteful number, since it uses less digits than its factorization.

28243117 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 612.

The product of its digits is 2688, while the sum is 28.

The square root of 28243117 is about 5314.4253687487. The cubic root of 28243117 is about 304.5352304958.

Adding to 28243117 its reverse (71134282), we get a palindrome (99377399).

The spelling of 28243117 in words is "twenty-eight million, two hundred forty-three thousand, one hundred seventeen".