28644223553 has 8 divisors (see below), whose sum is σ = 31250110080. Its totient is φ = 26038648080.

The previous prime is 28644223549. The next prime is 28644223561. The reversal of 28644223553 is 35532244682.

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 28644223553 - 2² = 28644223549 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28644223523) 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, 141743 + ... + 278171.

It is an arithmetic number, because the mean of its divisors is an integer number (3906263760).

Almost surely, 2^28644223553 is an apocalyptic number.

It is an amenable number.

28644223553 is a deficient number, since it is larger than the sum of its proper divisors (2605886527).

28644223553 is a wasteful number, since it uses less digits than its factorization.

28644223553 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 155527.

The product of its digits is 1382400, while the sum is 44.

The spelling of 28644223553 in words is "twenty-eight billion, six hundred forty-four million, two hundred twenty-three thousand, five hundred fifty-three".