28223066640 has 120 divisors (see below), whose sum is σ = 92338964928. Its totient is φ = 7130016000.

The previous prime is 28223066629. The next prime is 28223066657. The reversal of 28223066640 is 4666032282.

It is a tau number, because it is divible by the number of its divisors (120).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 76236 + ... + 249515.

Almost surely, 2^28223066640 is an apocalyptic number.

28223066640 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28223066640 is an abundant number, since it is smaller than the sum of its proper divisors (64115898288).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28223066640 is a wasteful number, since it uses less digits than its factorization.

28223066640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 325805 (or 325780 counting only the distinct ones).

The product of its (nonzero) digits is 165888, while the sum is 39.

The spelling of 28223066640 in words is "twenty-eight billion, two hundred twenty-three million, sixty-six thousand, six hundred forty".