28523117 has 4 divisors (see below), whose sum is σ = 32597856. Its totient is φ = 24448380.

The previous prime is 28523111. The next prime is 28523119. The reversal of 28523117 is 71132582.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 71132582 = 2 ⋅35566291.

It is a cyclic number.

It is not a de Polignac number, because 28523117 - 2⁴ = 28523101 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28523117.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28523111) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2037359 + ... + 2037372.

It is an arithmetic number, because the mean of its divisors is an integer number (8149464).

Almost surely, 2^28523117 is an apocalyptic number.

It is an amenable number.

28523117 is a deficient number, since it is larger than the sum of its proper divisors (4074739).

28523117 is an equidigital number, since it uses as much as digits as its factorization.

28523117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4074738.

The product of its digits is 3360, while the sum is 29.

The square root of 28523117 is about 5340.7037925727. The cubic root of 28523117 is about 305.5383022667.

Adding to 28523117 its reverse (71132582), we get a palindrome (99655699).

The spelling of 28523117 in words is "twenty-eight million, five hundred twenty-three thousand, one hundred seventeen".