28124317 has 4 divisors (see below), whose sum is σ = 30287740. Its totient is φ = 25960896.

The previous prime is 28124309. The next prime is 28124333. The reversal of 28124317 is 71342182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4756761 + 23367556 = 2181^2 + 4834^2 .

It is not a de Polignac number, because 28124317 - 2³ = 28124309 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 (28124357) 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 3 ways as a sum of consecutive naturals, for example, 1081692 + ... + 1081717.

It is an arithmetic number, because the mean of its divisors is an integer number (7571935).

Almost surely, 2^28124317 is an apocalyptic number.

It is an amenable number.

28124317 is a deficient number, since it is larger than the sum of its proper divisors (2163423).

28124317 is a wasteful number, since it uses less digits than its factorization.

28124317 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163422.

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

The square root of 28124317 is about 5303.2364646506. The cubic root of 28124317 is about 304.1076380438.

Adding to 28124317 its reverse (71342182), we get a palindrome (99466499).

It can be divided in two parts, 28124 and 317, that added together give a triangular number (28441 = T₂₃₈).

The spelling of 28124317 in words is "twenty-eight million, one hundred twenty-four thousand, three hundred seventeen".