28389765 has 8 divisors (see below), whose sum is σ = 45423648. Its totient is φ = 15141200.

The previous prime is 28389749. The next prime is 28389791. The reversal of 28389765 is 56798382.

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

It is not a de Polignac number, because 28389765 - 2⁴ = 28389749 is a prime.

It is a congruent number.

It is an unprimeable number.

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, 946311 + ... + 946340.

It is an arithmetic number, because the mean of its divisors is an integer number (5677956).

Almost surely, 2^28389765 is an apocalyptic number.

It is an amenable number.

28389765 is a deficient number, since it is larger than the sum of its proper divisors (17033883).

28389765 is a wasteful number, since it uses less digits than its factorization.

28389765 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1892659.

The product of its digits is 725760, while the sum is 48.

The square root of 28389765 is about 5328.2046694923. The cubic root of 28389765 is about 305.0614048185.

The spelling of 28389765 in words is "twenty-eight million, three hundred eighty-nine thousand, seven hundred sixty-five".