28641113 has 4 divisors (see below), whose sum is σ = 30148560. Its totient is φ = 27133668.

The previous prime is 28641101. The next prime is 28641157. The reversal of 28641113 is 31114682.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 31114682 = 2 ⋅15557341.

It is a cyclic number.

It is not a de Polignac number, because 28641113 - 2⁴ = 28641097 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 (28641013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 753695 + ... + 753732.

It is an arithmetic number, because the mean of its divisors is an integer number (7537140).

Almost surely, 2^28641113 is an apocalyptic number.

It is an amenable number.

28641113 is a deficient number, since it is larger than the sum of its proper divisors (1507447).

28641113 is a wasteful number, since it uses less digits than its factorization.

28641113 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1507446.

The product of its digits is 1152, while the sum is 26.

The square root of 28641113 is about 5351.7392500009. The cubic root of 28641113 is about 305.9590451689.

Adding to 28641113 its reverse (31114682), we get a palindrome (59755795).

The spelling of 28641113 in words is "twenty-eight million, six hundred forty-one thousand, one hundred thirteen".