28147579 has 4 divisors (see below), whose sum is σ = 28163176. Its totient is φ = 28131984.

The previous prime is 28147573. The next prime is 28147583. The reversal of 28147579 is 97574182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 97574182 = 2 ⋅48787091.

It is a cyclic number.

It is not a de Polignac number, because 28147579 - 2⁵ = 28147547 is a prime.

It is a super-2 number, since 2×28147579² = 1584572407122482, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28147573) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4674 + ... + 8839.

It is an arithmetic number, because the mean of its divisors is an integer number (7040794).

Almost surely, 2^28147579 is an apocalyptic number.

28147579 is a deficient number, since it is larger than the sum of its proper divisors (15597).

28147579 is a wasteful number, since it uses less digits than its factorization.

28147579 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15596.

The product of its digits is 141120, while the sum is 43.

The square root of 28147579 is about 5305.4292003569. The cubic root of 28147579 is about 304.1914587744.

The spelling of 28147579 in words is "twenty-eight million, one hundred forty-seven thousand, five hundred seventy-nine".