28102789 has 8 divisors (see below), whose sum is σ = 33016032. Its totient is φ = 23582640.

The previous prime is 28102787. The next prime is 28102793. The reversal of 28102789 is 98720182.

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 28102789 - 2¹ = 28102787 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 (28102783) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98119 + ... + 98404.

It is an arithmetic number, because the mean of its divisors is an integer number (4127004).

Almost surely, 2^28102789 is an apocalyptic number.

It is an amenable number.

28102789 is a deficient number, since it is larger than the sum of its proper divisors (4913243).

28102789 is a wasteful number, since it uses less digits than its factorization.

28102789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 196547.

The product of its (nonzero) digits is 16128, while the sum is 37.

The square root of 28102789 is about 5301.2063721383. The cubic root of 28102789 is about 304.0300243026.

The spelling of 28102789 in words is "twenty-eight million, one hundred two thousand, seven hundred eighty-nine".