28849639 has 8 divisors (see below), whose sum is σ = 35507360. Its totient is φ = 22826016.

The previous prime is 28849591. The next prime is 28849669. The reversal of 28849639 is 93694882.

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

It is a cyclic number.

It is not a de Polignac number, because 28849639 - 2⁷ = 28849511 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28849592 and 28849601.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28849669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 158424 + ... + 158605.

It is an arithmetic number, because the mean of its divisors is an integer number (4438420).

Almost surely, 2^28849639 is an apocalyptic number.

28849639 is a deficient number, since it is larger than the sum of its proper divisors (6657721).

28849639 is a wasteful number, since it uses less digits than its factorization.

28849639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 317049.

The product of its digits is 746496, while the sum is 49.

The square root of 28849639 is about 5371.1859956624. The cubic root of 28849639 is about 306.6997775895.

The spelling of 28849639 in words is "twenty-eight million, eight hundred forty-nine thousand, six hundred thirty-nine".