28909132 has 24 divisors (see below), whose sum is σ = 58018464. Its totient is φ = 12346752.

The previous prime is 28909123. The next prime is 28909147. The reversal of 28909132 is 23190982.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7248 + ... + 10504.

It is an arithmetic number, because the mean of its divisors is an integer number (2417436).

Almost surely, 2^28909132 is an apocalyptic number.

It is an amenable number.

28909132 is an abundant number, since it is smaller than the sum of its proper divisors (29109332).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28909132 is a wasteful number, since it uses less digits than its factorization.

28909132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3585 (or 3583 counting only the distinct ones).

The product of its (nonzero) digits is 7776, while the sum is 34.

The square root of 28909132 is about 5376.7213057773. The cubic root of 28909132 is about 306.9104556935.

The spelling of 28909132 in words is "twenty-eight million, nine hundred nine thousand, one hundred thirty-two".