28909924 has 12 divisors (see below), whose sum is σ = 50848000. Its totient is φ = 14381928.

The previous prime is 28909921. The next prime is 28909939. The reversal of 28909924 is 42990982.

It is a happy number.

It is a hoax number, since the sum of its digits (43) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (28909921) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 17364 + ... + 18955.

Almost surely, 2^28909924 is an apocalyptic number.

It is an amenable number.

28909924 is a deficient number, since it is larger than the sum of its proper divisors (21938076).

28909924 is a wasteful number, since it uses less digits than its factorization.

28909924 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36522 (or 36520 counting only the distinct ones).

The product of its (nonzero) digits is 93312, while the sum is 43.

The square root of 28909924 is about 5376.7949561054. The cubic root of 28909924 is about 306.9132583934.

The spelling of 28909924 in words is "twenty-eight million, nine hundred nine thousand, nine hundred twenty-four".