28653889 has 12 divisors (see below), whose sum is σ = 32515840. Its totient is φ = 25205400.

The previous prime is 28653871. The next prime is 28653893. The reversal of 28653889 is 98835682.

It is not a de Polignac number, because 28653889 - 2¹⁵ = 28621121 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 (28653809) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 69 + ... + 7570.

Almost surely, 2^28653889 is an apocalyptic number.

It is an amenable number.

28653889 is a deficient number, since it is larger than the sum of its proper divisors (3861951).

28653889 is a wasteful number, since it uses less digits than its factorization.

28653889 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7692 (or 7681 counting only the distinct ones).

The product of its digits is 829440, while the sum is 49.

The square root of 28653889 is about 5352.9327475693. The cubic root of 28653889 is about 306.0045316657.

The spelling of 28653889 in words is "twenty-eight million, six hundred fifty-three thousand, eight hundred eighty-nine".