28398789 has 16 divisors (see below), whose sum is σ = 44547840. Its totient is φ = 17818560.

The previous prime is 28398781. The next prime is 28398809. The reversal of 28398789 is 98789382.

It is not a de Polignac number, because 28398789 - 2³ = 28398781 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28398781) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 30477 + ... + 31394.

It is an arithmetic number, because the mean of its divisors is an integer number (2784240).

Almost surely, 2^28398789 is an apocalyptic number.

It is an amenable number.

28398789 is a deficient number, since it is larger than the sum of its proper divisors (16149051).

28398789 is a wasteful number, since it uses less digits than its factorization.

28398789 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 61897 (or 61891 counting only the distinct ones).

The product of its digits is 1741824, while the sum is 54.

The square root of 28398789 is about 5329.0514165281. The cubic root of 28398789 is about 305.0937237720.

It can be divided in two parts, 2839 and 8789, that added together give a triangular number (11628 = T₁₅₂).

The spelling of 28398789 in words is "twenty-eight million, three hundred ninety-eight thousand, seven hundred eighty-nine".