28188155639 has 8 divisors (see below), whose sum is σ = 32603168640. Its totient is φ = 23870176056.

The previous prime is 28188155627. The next prime is 28188155669. The reversal of 28188155639 is 93655188182.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 28188155639 - 2¹² = 28188151543 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28188155669) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 24257729 + ... + 24258890.

It is an arithmetic number, because the mean of its divisors is an integer number (4075396080).

Almost surely, 2^28188155639 is an apocalyptic number.

28188155639 is a deficient number, since it is larger than the sum of its proper divisors (4415013001).

28188155639 is an equidigital number, since it uses as much as digits as its factorization.

28188155639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48516709.

The product of its digits is 4147200, while the sum is 56.

The spelling of 28188155639 in words is "twenty-eight billion, one hundred eighty-eight million, one hundred fifty-five thousand, six hundred thirty-nine".