28279530 has 40 divisors (see below), whose sum is σ = 76042692. Its totient is φ = 7540992.

The previous prime is 28279519. The next prime is 28279549. The reversal of 28279530 is 3597282.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 28100601 + 178929 = 5301^2 + 423^2 .

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 16647 + ... + 18266.

Almost surely, 2^28279530 is an apocalyptic number.

28279530 is an abundant number, since it is smaller than the sum of its proper divisors (47763162).

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

28279530 is a wasteful number, since it uses less digits than its factorization.

28279530 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34932 (or 34923 counting only the distinct ones).

The product of its (nonzero) digits is 30240, while the sum is 36.

The square root of 28279530 is about 5317.8501295166. The cubic root of 28279530 is about 304.6660503243. Note that the first 3 decimals are identical.

The spelling of 28279530 in words is "twenty-eight million, two hundred seventy-nine thousand, five hundred thirty".