28521727387 has 4 divisors (see below), whose sum is σ = 28622511160. Its totient is φ = 28420943616.

The previous prime is 28521727357. The next prime is 28521727397. The reversal of 28521727387 is 78372712582.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 78372712582 = 2 ⋅39186356291.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28521727387 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28521727357) 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, 50391462 + ... + 50392027.

It is an arithmetic number, because the mean of its divisors is an integer number (7155627790).

Almost surely, 2^28521727387 is an apocalyptic number.

28521727387 is a deficient number, since it is larger than the sum of its proper divisors (100783773).

28521727387 is a wasteful number, since it uses less digits than its factorization.

28521727387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 100783772.

The product of its digits is 2634240, while the sum is 52.

The spelling of 28521727387 in words is "twenty-eight billion, five hundred twenty-one million, seven hundred twenty-seven thousand, three hundred eighty-seven".