28152517 has 4 divisors (see below), whose sum is σ = 28176940. Its totient is φ = 28128096.

The previous prime is 28152511. The next prime is 28152563. The reversal of 28152517 is 71525182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 71525182 = 2 ⋅35762591.

It can be written as a sum of positive squares in 2 ways, for example, as 9541921 + 18610596 = 3089^2 + 4314^2 .

It is a cyclic number.

It is not a de Polignac number, because 28152517 - 2¹¹ = 28150469 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 (28152511) 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, 10392 + ... + 12817.

It is an arithmetic number, because the mean of its divisors is an integer number (7044235).

Almost surely, 2^28152517 is an apocalyptic number.

It is an amenable number.

28152517 is a deficient number, since it is larger than the sum of its proper divisors (24423).

28152517 is a wasteful number, since it uses less digits than its factorization.

28152517 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24422.

The product of its digits is 5600, while the sum is 31.

The square root of 28152517 is about 5305.8945522880. The cubic root of 28152517 is about 304.2092460898.

Adding to 28152517 its reverse (71525182), we get a palindrome (99677699).

The spelling of 28152517 in words is "twenty-eight million, one hundred fifty-two thousand, five hundred seventeen".