28148539 has 4 divisors (see below), whose sum is σ = 28206360. Its totient is φ = 28090720.

The previous prime is 28148521. The next prime is 28148551. The reversal of 28148539 is 93584182.

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

It is a cyclic number.

It is not a de Polignac number, because 28148539 - 2⁹ = 28148027 is a prime.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28148579) 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, 28174 + ... + 29155.

It is an arithmetic number, because the mean of its divisors is an integer number (7051590).

Almost surely, 2^28148539 is an apocalyptic number.

28148539 is a deficient number, since it is larger than the sum of its proper divisors (57821).

28148539 is an equidigital number, since it uses as much as digits as its factorization.

28148539 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 57820.

The product of its digits is 69120, while the sum is 40.

The square root of 28148539 is about 5305.5196729444. The cubic root of 28148539 is about 304.1949169816.

The spelling of 28148539 in words is "twenty-eight million, one hundred forty-eight thousand, five hundred thirty-nine".