28171864 has 24 divisors (see below), whose sum is σ = 61447140. Its totient is φ = 12073488.

The previous prime is 28171861. The next prime is 28171867. The reversal of 28171864 is 46817182.

It is an interprime number because it is at equal distance from previous prime (28171861) and next prime (28171867).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28171861) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 35542 + ... + 36325.

Almost surely, 2^28171864 is an apocalyptic number.

It is an amenable number.

28171864 is an abundant number, since it is smaller than the sum of its proper divisors (33275276).

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

28171864 is a wasteful number, since it uses less digits than its factorization.

28171864 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 71887 (or 71876 counting only the distinct ones).

The product of its digits is 21504, while the sum is 37.

The square root of 28171864 is about 5307.7174001637. The cubic root of 28171864 is about 304.2789164568.

The spelling of 28171864 in words is "twenty-eight million, one hundred seventy-one thousand, eight hundred sixty-four".