28249589 has 4 divisors (see below), whose sum is σ = 29477856. Its totient is φ = 27021324.

The previous prime is 28249549. The next prime is 28249591. The reversal of 28249589 is 98594282.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 98594282 = 2 ⋅49297141.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28249589 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 (28249549) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 614099 + ... + 614144.

It is an arithmetic number, because the mean of its divisors is an integer number (7369464).

Almost surely, 2^28249589 is an apocalyptic number.

It is an amenable number.

28249589 is a deficient number, since it is larger than the sum of its proper divisors (1228267).

28249589 is a wasteful number, since it uses less digits than its factorization.

28249589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1228266.

The product of its digits is 414720, while the sum is 47.

The square root of 28249589 is about 5315.0342425990. The cubic root of 28249589 is about 304.5584904577.

The spelling of 28249589 in words is "twenty-eight million, two hundred forty-nine thousand, five hundred eighty-nine".