28797113 has 4 divisors (see below), whose sum is σ = 29191668. Its totient is φ = 28402560.

The previous prime is 28797101. The next prime is 28797149. The reversal of 28797113 is 31179782.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 31179782 = 2 ⋅15589891.

It can be written as a sum of positive squares in 2 ways, for example, as 15342889 + 13454224 = 3917^2 + 3668^2 .

It is a cyclic number.

It is not a de Polignac number, because 28797113 - 2²⁴ = 12019897 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28797163) 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, 197168 + ... + 197313.

It is an arithmetic number, because the mean of its divisors is an integer number (7297917).

Almost surely, 2^28797113 is an apocalyptic number.

It is an amenable number.

28797113 is a deficient number, since it is larger than the sum of its proper divisors (394555).

28797113 is an equidigital number, since it uses as much as digits as its factorization.

28797113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 394554.

The product of its digits is 21168, while the sum is 38.

The square root of 28797113 is about 5366.2941589145. The cubic root of 28797113 is about 306.5135303220.

The spelling of 28797113 in words is "twenty-eight million, seven hundred ninety-seven thousand, one hundred thirteen".