28159147 has 4 divisors (see below), whose sum is σ = 28266480. Its totient is φ = 28051816.

The previous prime is 28159141. The next prime is 28159151. The reversal of 28159147 is 74195182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 74195182 = 2 ⋅37097591.

It is a cyclic number.

It is not a de Polignac number, because 28159147 - 2³ = 28159139 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28159141) 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, 53272 + ... + 53797.

It is an arithmetic number, because the mean of its divisors is an integer number (7066620).

Almost surely, 2^28159147 is an apocalyptic number.

28159147 is a deficient number, since it is larger than the sum of its proper divisors (107333).

28159147 is a wasteful number, since it uses less digits than its factorization.

28159147 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107332.

The product of its digits is 20160, while the sum is 37.

The square root of 28159147 is about 5306.5192923422. The cubic root of 28159147 is about 304.2331249374.

The spelling of 28159147 in words is "twenty-eight million, one hundred fifty-nine thousand, one hundred forty-seven".