28647149 has 4 divisors (see below), whose sum is σ = 28792764. Its totient is φ = 28501536.

The previous prime is 28647133. The next prime is 28647161. The reversal of 28647149 is 94174682.

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 28281124 + 366025 = 5318^2 + 605^2 .

It is a cyclic number.

It is not a de Polignac number, because 28647149 - 2⁴ = 28647133 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28647109) 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, 72512 + ... + 72905.

It is an arithmetic number, because the mean of its divisors is an integer number (7198191).

Almost surely, 2^28647149 is an apocalyptic number.

It is an amenable number.

28647149 is a deficient number, since it is larger than the sum of its proper divisors (145615).

28647149 is a wasteful number, since it uses less digits than its factorization.

28647149 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 145614.

The product of its digits is 96768, while the sum is 41.

The square root of 28647149 is about 5352.3031491125. The cubic root of 28647149 is about 305.9805368742.

The spelling of 28647149 in words is "twenty-eight million, six hundred forty-seven thousand, one hundred forty-nine".