28644727 has 4 divisors (see below), whose sum is σ = 28780696. Its totient is φ = 28508760.

The previous prime is 28644719. The next prime is 28644731. The reversal of 28644727 is 72744682.

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

It is a cyclic number.

It is not a de Polignac number, because 28644727 - 2³ = 28644719 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28644727.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28644767) 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, 67668 + ... + 68089.

It is an arithmetic number, because the mean of its divisors is an integer number (7195174).

Almost surely, 2^28644727 is an apocalyptic number.

28644727 is a deficient number, since it is larger than the sum of its proper divisors (135969).

28644727 is a wasteful number, since it uses less digits than its factorization.

28644727 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 135968.

The product of its digits is 150528, while the sum is 40.

The square root of 28644727 is about 5352.0768865927. The cubic root of 28644727 is about 305.9719134943.

The spelling of 28644727 in words is "twenty-eight million, six hundred forty-four thousand, seven hundred twenty-seven".