28171282 has 12 divisors (see below), whose sum is σ = 43434090. Its totient is φ = 13703616.

The previous prime is 28171277. The next prime is 28171291. The reversal of 28171282 is 28217182.

It can be written as a sum of positive squares in 3 ways, for example, as 25918281 + 2253001 = 5091^2 + 1501^2 .

It is a super-2 number, since 2×28171282² = 1587242259047048, which contains 22 as substring.

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 5 ways as a sum of consecutive naturals, for example, 2407 + ... + 7882.

Almost surely, 2^28171282 is an apocalyptic number.

28171282 is a deficient number, since it is larger than the sum of its proper divisors (15262808).

28171282 is a wasteful number, since it uses less digits than its factorization.

28171282 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10365 (or 10328 counting only the distinct ones).

The product of its digits is 3584, while the sum is 31.

The square root of 28171282 is about 5307.6625740527. The cubic root of 28171282 is about 304.2768210855.

The spelling of 28171282 in words is "twenty-eight million, one hundred seventy-one thousand, two hundred eighty-two".