28116145 has 4 divisors (see below), whose sum is σ = 33739380. Its totient is φ = 22492912.

The previous prime is 28116131. The next prime is 28116173. The reversal of 28116145 is 54161182.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4700224 + 23415921 = 2168^2 + 4839^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28116145 is a prime.

It is a super-2 number, since 2×28116145² = 1581035219322050, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2811610 + ... + 2811619.

It is an arithmetic number, because the mean of its divisors is an integer number (8434845).

Almost surely, 2^28116145 is an apocalyptic number.

It is an amenable number.

28116145 is a deficient number, since it is larger than the sum of its proper divisors (5623235).

28116145 is an equidigital number, since it uses as much as digits as its factorization.

28116145 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5623234.

The product of its digits is 1920, while the sum is 28.

The square root of 28116145 is about 5302.4659357699. The cubic root of 28116145 is about 304.0781806368.

The spelling of 28116145 in words is "twenty-eight million, one hundred sixteen thousand, one hundred forty-five".