28187173727 has 4 divisors (see below), whose sum is σ = 28209008616. Its totient is φ = 28165338840.

The previous prime is 28187173717. The next prime is 28187173733. The reversal of 28187173727 is 72737178182.

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 28187173727 - 2¹⁰ = 28187172703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28187173717) 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, 10915508 + ... + 10918089.

It is an arithmetic number, because the mean of its divisors is an integer number (7052252154).

Almost surely, 2^28187173727 is an apocalyptic number.

28187173727 is a deficient number, since it is larger than the sum of its proper divisors (21834889).

28187173727 is a wasteful number, since it uses less digits than its factorization.

28187173727 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21834888.

The product of its digits is 1843968, while the sum is 53.

The spelling of 28187173727 in words is "twenty-eight billion, one hundred eighty-seven million, one hundred seventy-three thousand, seven hundred twenty-seven".