28171012 has 6 divisors (see below), whose sum is σ = 49299278. Its totient is φ = 14085504.

The previous prime is 28171009. The next prime is 28171043. The reversal of 28171012 is 21017182.

It can be written as a sum of positive squares in only one way, i.e., 20196036 + 7974976 = 4494^2 + 2824^2 .

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 as a sum of consecutive naturals, namely, 3521373 + ... + 3521380.

Almost surely, 2^28171012 is an apocalyptic number.

It is an amenable number.

28171012 is a deficient number, since it is larger than the sum of its proper divisors (21128266).

28171012 is a wasteful number, since it uses less digits than its factorization.

28171012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7042757 (or 7042755 counting only the distinct ones).

The product of its (nonzero) digits is 224, while the sum is 22.

The square root of 28171012 is about 5307.6371390667. The cubic root of 28171012 is about 304.2758489962.

Adding to 28171012 its reverse (21017182), we get a palindrome (49188194).

The spelling of 28171012 in words is "twenty-eight million, one hundred seventy-one thousand, twelve".