28171995 has 16 divisors (see below), whose sum is σ = 45407520. Its totient is φ = 14914304.

The previous prime is 28171993. The next prime is 28171999. The reversal of 28171995 is 59917182.

It is a cyclic number.

It is not a de Polignac number, because 28171995 - 2¹ = 28171993 is a prime.

It is a super-2 number, since 2×28171995² = 1587322604560050, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28171993) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4800 + ... + 8909.

It is an arithmetic number, because the mean of its divisors is an integer number (2837970).

Almost surely, 2^28171995 is an apocalyptic number.

28171995 is a deficient number, since it is larger than the sum of its proper divisors (17235525).

28171995 is a wasteful number, since it uses less digits than its factorization.

28171995 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13854.

The product of its digits is 45360, while the sum is 42.

The square root of 28171995 is about 5307.7297406707. The cubic root of 28171995 is about 304.2793880914.

The spelling of 28171995 in words is "twenty-eight million, one hundred seventy-one thousand, nine hundred ninety-five".