28489293 has 32 divisors (see below), whose sum is σ = 48491520. Its totient is φ = 16193520.

The previous prime is 28489289. The next prime is 28489313. The reversal of 28489293 is 39298482.

28489293 is a `hidden beast` number, since 284 + 89 + 293 = 666.

It is not a de Polignac number, because 28489293 - 2² = 28489289 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28489273) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 57778 + ... + 58268.

It is an arithmetic number, because the mean of its divisors is an integer number (1515360).

Almost surely, 2^28489293 is an apocalyptic number.

It is an amenable number.

28489293 is a deficient number, since it is larger than the sum of its proper divisors (20002227).

28489293 is a wasteful number, since it uses less digits than its factorization.

28489293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 814 (or 808 counting only the distinct ones).

The product of its digits is 248832, while the sum is 45.

The square root of 28489293 is about 5337.5362293852. The cubic root of 28489293 is about 305.4174807908.

It can be divided in two parts, 28489 and 293, that added together give a palindrome (28782).

The spelling of 28489293 in words is "twenty-eight million, four hundred eighty-nine thousand, two hundred ninety-three".