28647279 has 12 divisors (see below), whose sum is σ = 41503176. Its totient is φ = 19041072.

The previous prime is 28647221. The next prime is 28647341. The reversal of 28647279 is 97274682.

It is not a de Polignac number, because 28647279 - 2⁹ = 28646767 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28647209) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1464 + ... + 7709.

It is an arithmetic number, because the mean of its divisors is an integer number (3458598).

Almost surely, 2^28647279 is an apocalyptic number.

28647279 is a deficient number, since it is larger than the sum of its proper divisors (12855897).

28647279 is a wasteful number, since it uses less digits than its factorization.

28647279 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9526 (or 9523 counting only the distinct ones).

The product of its digits is 338688, while the sum is 45.

The square root of 28647279 is about 5352.3152934034. The cubic root of 28647279 is about 305.9809997173.

The spelling of 28647279 in words is "twenty-eight million, six hundred forty-seven thousand, two hundred seventy-nine".