28608887506 has 4 divisors (see below), whose sum is σ = 42913331262. Its totient is φ = 14304443752.

The previous prime is 28608887491. The next prime is 28608887513. The reversal of 28608887506 is 60578880682.

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

It can be written as a sum of positive squares in only one way, i.e., 25236181881 + 3372705625 = 158859^2 + 58075^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7152221875 + ... + 7152221878.

Almost surely, 2^28608887506 is an apocalyptic number.

28608887506 is a deficient number, since it is larger than the sum of its proper divisors (14304443756).

28608887506 is a wasteful number, since it uses less digits than its factorization.

28608887506 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14304443755.

The product of its (nonzero) digits is 10321920, while the sum is 58.

The spelling of 28608887506 in words is "twenty-eight billion, six hundred eight million, eight hundred eighty-seven thousand, five hundred six".