28147613 has 4 divisors (see below), whose sum is σ = 30312828. Its totient is φ = 25982400.

The previous prime is 28147591. The next prime is 28147633. The reversal of 28147613 is 31674182.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31674182 = 2 ⋅15837091.

It can be written as a sum of positive squares in 2 ways, for example, as 9467929 + 18679684 = 3077^2 + 4322^2 .

It is a cyclic number.

It is not a de Polignac number, because 28147613 - 2¹⁰ = 28146589 is a prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 28147613.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28147633) 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, 1082588 + ... + 1082613.

It is an arithmetic number, because the mean of its divisors is an integer number (7578207).

Almost surely, 2^28147613 is an apocalyptic number.

It is an amenable number.

28147613 is a deficient number, since it is larger than the sum of its proper divisors (2165215).

28147613 is a wasteful number, since it uses less digits than its factorization.

28147613 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2165214.

The product of its digits is 8064, while the sum is 32.

The square root of 28147613 is about 5305.4324046208. The cubic root of 28147613 is about 304.1915812539.

The spelling of 28147613 in words is "twenty-eight million, one hundred forty-seven thousand, six hundred thirteen".