28447132 has 24 divisors (see below), whose sum is σ = 57125376. Its totient is φ = 12142128.

The previous prime is 28447063. The next prime is 28447157. The reversal of 28447132 is 23174482.

28447132 = 189² + 190² + ... + 451².

It is a junction number, because it is equal to n+sod(n) for n = 28447094 and 28447103.

It is a congruent number.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 5433 + ... + 9295.

It is an arithmetic number, because the mean of its divisors is an integer number (2380224).

Almost surely, 2^28447132 is an apocalyptic number.

It is an amenable number.

28447132 is an abundant number, since it is smaller than the sum of its proper divisors (28678244).

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

28447132 is a wasteful number, since it uses less digits than its factorization.

28447132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4137 (or 4135 counting only the distinct ones).

The product of its digits is 10752, while the sum is 31.

The square root of 28447132 is about 5333.5852857154. The cubic root of 28447132 is about 305.2667450545.

The spelling of 28447132 in words is "twenty-eight million, four hundred forty-seven thousand, one hundred thirty-two".