28715589 has 48 divisors (see below), whose sum is σ = 49573888. Its totient is φ = 15676416.

The previous prime is 28715587. The next prime is 28715627. The reversal of 28715589 is 98551782.

It is a happy number.

28715589 is a `hidden beast` number, since 28 + 71 + 558 + 9 = 666.

It is not a de Polignac number, because 28715589 - 2¹ = 28715587 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28715581) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 226044 + ... + 226170.

Almost surely, 2^28715589 is an apocalyptic number.

It is an amenable number.

28715589 is a deficient number, since it is larger than the sum of its proper divisors (20858299).

28715589 is a wasteful number, since it uses less digits than its factorization.

28715589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 274 (or 271 counting only the distinct ones).

The product of its digits is 201600, while the sum is 45.

The square root of 28715589 is about 5358.6928443418. The cubic root of 28715589 is about 306.2240125665.

It can be divided in two parts, 287 and 15589, that added together give a square (15876 = 126²).

The spelling of 28715589 in words is "twenty-eight million, seven hundred fifteen thousand, five hundred eighty-nine".