28136645 has 8 divisors (see below), whose sum is σ = 33822240. Its totient is φ = 22470480.

The previous prime is 28136611. The next prime is 28136651. The reversal of 28136645 is 54663182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28136645 - 2¹² = 28132549 is a prime.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 1451 + ... + 7640.

It is an arithmetic number, because the mean of its divisors is an integer number (4227780).

Almost surely, 2^28136645 is an apocalyptic number.

It is an amenable number.

28136645 is a deficient number, since it is larger than the sum of its proper divisors (5685595).

28136645 is an equidigital number, since it uses as much as digits as its factorization.

28136645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9715.

The product of its digits is 34560, while the sum is 35.

The square root of 28136645 is about 5304.3986464066. The cubic root of 28136645 is about 304.1520656864.

The spelling of 28136645 in words is "twenty-eight million, one hundred thirty-six thousand, six hundred forty-five".