28717871 has 12 divisors (see below), whose sum is σ = 35977032. Its totient is φ = 22721328.

The previous prime is 28717861. The next prime is 28717877. The reversal of 28717871 is 17871782.

It is not a de Polignac number, because 28717871 - 2⁶ = 28717807 is a prime.

It is a super-2 number, since 2×28717871² = 1649432229545282, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28717877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 21905 + ... + 23178.

It is an arithmetic number, because the mean of its divisors is an integer number (2998086).

Almost surely, 2^28717871 is an apocalyptic number.

28717871 is a deficient number, since it is larger than the sum of its proper divisors (7259161).

28717871 is a wasteful number, since it uses less digits than its factorization.

28717871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45110 (or 45103 counting only the distinct ones).

The product of its digits is 43904, while the sum is 41.

The square root of 28717871 is about 5358.9057651726. The cubic root of 28717871 is about 306.2321241267.

The spelling of 28717871 in words is "twenty-eight million, seven hundred seventeen thousand, eight hundred seventy-one".