28656789 has 8 divisors (see below), whose sum is σ = 43667520. Its totient is φ = 16375296.

The previous prime is 28656787. The next prime is 28656799. The reversal of 28656789 is 98765682.

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

It is not a de Polignac number, because 28656789 - 2¹ = 28656787 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28656787) 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, 682284 + ... + 682325.

It is an arithmetic number, because the mean of its divisors is an integer number (5458440).

Almost surely, 2^28656789 is an apocalyptic number.

It is an amenable number.

28656789 is a deficient number, since it is larger than the sum of its proper divisors (15010731).

28656789 is a wasteful number, since it uses less digits than its factorization.

28656789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1364619.

The product of its digits is 1451520, while the sum is 51.

The square root of 28656789 is about 5353.2036202633. The cubic root of 28656789 is about 306.0148546764.

It can be divided in two parts, 286 and 56789, that added together give a palindrome (57075).

The spelling of 28656789 in words is "twenty-eight million, six hundred fifty-six thousand, seven hundred eighty-nine".