28125071 has 4 divisors (see below), whose sum is σ = 30288552. Its totient is φ = 25961592.

The previous prime is 28125061. The next prime is 28125079. The reversal of 28125071 is 17052182.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 28125071 - 2⁶ = 28125007 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28125071.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28125079) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1081721 + ... + 1081746.

It is an arithmetic number, because the mean of its divisors is an integer number (7572138).

Almost surely, 2^28125071 is an apocalyptic number.

28125071 is a deficient number, since it is larger than the sum of its proper divisors (2163481).

28125071 is a wasteful number, since it uses less digits than its factorization.

28125071 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2163480.

The product of its (nonzero) digits is 1120, while the sum is 26.

The square root of 28125071 is about 5303.3075528391. The cubic root of 28125071 is about 304.1103556815.

It can be divided in two parts, 281 and 25071, that added together give a palindrome (25352).

The spelling of 28125071 in words is "twenty-eight million, one hundred twenty-five thousand, seventy-one".