28389647 has 8 divisors (see below), whose sum is σ = 33353040. Its totient is φ = 23823360.

The previous prime is 28389631. The next prime is 28389701. The reversal of 28389647 is 74698382.

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

It is not a de Polignac number, because 28389647 - 2⁴ = 28389631 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 (28389617) 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, 99122 + ... + 99407.

It is an arithmetic number, because the mean of its divisors is an integer number (4169130).

Almost surely, 2^28389647 is an apocalyptic number.

28389647 is a deficient number, since it is larger than the sum of its proper divisors (4963393).

28389647 is a wasteful number, since it uses less digits than its factorization.

28389647 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 198553.

The product of its digits is 580608, while the sum is 47.

The square root of 28389647 is about 5328.1935963326. The cubic root of 28389647 is about 305.0609821627.

The spelling of 28389647 in words is "twenty-eight million, three hundred eighty-nine thousand, six hundred forty-seven".