28840132 has 12 divisors (see below), whose sum is σ = 50654380. Its totient is φ = 14367456.

The previous prime is 28840127. The next prime is 28840153. The reversal of 28840132 is 23104882.

It can be written as a sum of positive squares in 2 ways, for example, as 2768896 + 26071236 = 1664^2 + 5106^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28840132.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11907 + ... + 14122.

Almost surely, 2^28840132 is an apocalyptic number.

It is an amenable number.

28840132 is a deficient number, since it is larger than the sum of its proper divisors (21814248).

28840132 is a wasteful number, since it uses less digits than its factorization.

28840132 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 26310 (or 26308 counting only the distinct ones).

The product of its (nonzero) digits is 3072, while the sum is 28.

The square root of 28840132 is about 5370.3009226672. The cubic root of 28840132 is about 306.6660843299. Note that the first 3 decimals are identical.

The spelling of 28840132 in words is "twenty-eight million, eight hundred forty thousand, one hundred thirty-two".