28289812 has 24 divisors (see below), whose sum is σ = 50558816. Its totient is φ = 13847328.

The previous prime is 28289801. The next prime is 28289813. The reversal of 28289812 is 21898282.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28289813) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75658 + ... + 76030.

Almost surely, 2^28289812 is an apocalyptic number.

It is an amenable number.

28289812 is a deficient number, since it is larger than the sum of its proper divisors (22269004).

28289812 is a wasteful number, since it uses less digits than its factorization.

28289812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 727 (or 725 counting only the distinct ones).

The product of its digits is 36864, while the sum is 40.

The square root of 28289812 is about 5318.8167857147. The cubic root of 28289812 is about 304.7029698058.

The spelling of 28289812 in words is "twenty-eight million, two hundred eighty-nine thousand, eight hundred twelve".