28252442639 has 8 divisors (see below), whose sum is σ = 28284752160. Its totient is φ = 28220154336.

The previous prime is 28252442599. The next prime is 28252442663. The reversal of 28252442639 is 93624425282.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28252442639 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 28252442593 and 28252442602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28252442539) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4683077 + ... + 4689105.

It is an arithmetic number, because the mean of its divisors is an integer number (3535594020).

Almost surely, 2^28252442639 is an apocalyptic number.

28252442639 is a deficient number, since it is larger than the sum of its proper divisors (32309521).

28252442639 is a wasteful number, since it uses less digits than its factorization.

28252442639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10609.

The product of its digits is 1658880, while the sum is 47.

The spelling of 28252442639 in words is "twenty-eight billion, two hundred fifty-two million, four hundred forty-two thousand, six hundred thirty-nine".