28271716 has 24 divisors (see below), whose sum is σ = 54139680. Its totient is φ = 12811200.

The previous prime is 28271699. The next prime is 28271729. The reversal of 28271716 is 61717282.

It is a happy number.

It is a super-3 number, since 3×28271716³ (a number of 23 digits) contains 333 as substring.

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 in 7 ways as a sum of consecutive naturals, for example, 17211 + ... + 18781.

It is an arithmetic number, because the mean of its divisors is an integer number (2255820).

Almost surely, 2^28271716 is an apocalyptic number.

It is an amenable number.

28271716 is a deficient number, since it is larger than the sum of its proper divisors (25867964).

28271716 is a wasteful number, since it uses less digits than its factorization.

28271716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1995 (or 1993 counting only the distinct ones).

The product of its digits is 9408, while the sum is 34.

The square root of 28271716 is about 5317.1153833634. The cubic root of 28271716 is about 304.6379866823.

Adding to 28271716 its product of digits (9408), we get a square (28281124 = 5318²).

Adding to 28271716 its reverse (61717282), we get a palindrome (89988998).

The spelling of 28271716 in words is "twenty-eight million, two hundred seventy-one thousand, seven hundred sixteen".