28447284 has 12 divisors (see below), whose sum is σ = 66377024. Its totient is φ = 9482424.

The previous prime is 28447283. The next prime is 28447291. The reversal of 28447284 is 48274482.

It is a tau number, because it is divible by the number of its divisors (12).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28447283) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1185292 + ... + 1185315.

Almost surely, 2^28447284 is an apocalyptic number.

It is an amenable number.

28447284 is an abundant number, since it is smaller than the sum of its proper divisors (37929740).

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

28447284 is a wasteful number, since it uses less digits than its factorization.

28447284 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2370614 (or 2370612 counting only the distinct ones).

The product of its digits is 114688, while the sum is 39.

The square root of 28447284 is about 5333.5995350232. The cubic root of 28447284 is about 305.2672887586.

The spelling of 28447284 in words is "twenty-eight million, four hundred forty-seven thousand, two hundred eighty-four".