28127197 has 24 divisors (see below), whose sum is σ = 35100864. Its totient is φ = 22000512.

The previous prime is 28127191. The next prime is 28127207. The reversal of 28127197 is 79172182.

It is a de Polignac number, because none of the positive numbers 2^k-28127197 is a prime.

It is a super-3 number, since 3×28127197³ (a number of 23 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28127191) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 262818 + ... + 262924.

It is an arithmetic number, because the mean of its divisors is an integer number (1462536).

Almost surely, 2^28127197 is an apocalyptic number.

It is an amenable number.

28127197 is a deficient number, since it is larger than the sum of its proper divisors (6973667).

28127197 is a wasteful number, since it uses less digits than its factorization.

28127197 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 225 (or 178 counting only the distinct ones).

The product of its digits is 14112, while the sum is 37.

The square root of 28127197 is about 5303.5079900006. The cubic root of 28127197 is about 304.1180181490.

The spelling of 28127197 in words is "twenty-eight million, one hundred twenty-seven thousand, one hundred ninety-seven".