28271712 has 48 divisors (see below), whose sum is σ = 84817152. Its totient is φ = 8077440.

The previous prime is 28271699. The next prime is 28271729. The reversal of 28271712 is 21717282.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (48).

It is a nude number because it is divisible by every one of its digits.

It is a self number, because there is not a number n which added to its sum of digits gives 28271712.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 20364 + ... + 21707.

It is an arithmetic number, because the mean of its divisors is an integer number (1767024).

Almost surely, 2^28271712 is an apocalyptic number.

It is an amenable number.

28271712 is an abundant number, since it is smaller than the sum of its proper divisors (56545440).

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

28271712 is a wasteful number, since it uses less digits than its factorization.

28271712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42091 (or 42083 counting only the distinct ones).

The product of its digits is 3136, while the sum is 30.

The square root of 28271712 is about 5317.1150072196. The cubic root of 28271712 is about 304.6379723151.

Adding to 28271712 its reverse (21717282), we get a palindrome (49988994).

The spelling of 28271712 in words is "twenty-eight million, two hundred seventy-one thousand, seven hundred twelve".