28856922644 has 36 divisors (see below), whose sum is σ = 55524840000. Its totient is φ = 13112766480.

The previous prime is 28856922643. The next prime is 28856922659. The reversal of 28856922644 is 44622965882.

It is a self number, because there is not a number n which added to its sum of digits gives 28856922644.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28856922641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2054357 + ... + 2068355.

Almost surely, 2^28856922644 is an apocalyptic number.

It is an amenable number.

28856922644 is a deficient number, since it is larger than the sum of its proper divisors (26667917356).

28856922644 is a wasteful number, since it uses less digits than its factorization.

28856922644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18284 (or 18271 counting only the distinct ones).

The product of its digits is 13271040, while the sum is 56.

The spelling of 28856922644 in words is "twenty-eight billion, eight hundred fifty-six million, nine hundred twenty-two thousand, six hundred forty-four".