28223066644 has 12 divisors (see below), whose sum is σ = 49391912500. Its totient is φ = 14111091648.

The previous prime is 28223066629. The next prime is 28223066657. The reversal of 28223066644 is 44666032282.

It can be written as a sum of positive squares in 2 ways, for example, as 16838176644 + 11384890000 = 129762^2 + 106700^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 28223066644.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 63952 + ... + 246040.

Almost surely, 2^28223066644 is an apocalyptic number.

It is an amenable number.

28223066644 is a deficient number, since it is larger than the sum of its proper divisors (21168845856).

28223066644 is a wasteful number, since it uses less digits than its factorization.

28223066644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 220842 (or 220840 counting only the distinct ones).

The product of its (nonzero) digits is 663552, while the sum is 43.

The spelling of 28223066644 in words is "twenty-eight billion, two hundred twenty-three million, sixty-six thousand, six hundred forty-four".