28145229388 has 24 divisors (see below), whose sum is σ = 49960353744. Its totient is φ = 13872000000.

The previous prime is 28145229353. The next prime is 28145229439. The reversal of 28145229388 is 88392254182.

It is an unprimeable number.

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, 47113 + ... + 241888.

It is an arithmetic number, because the mean of its divisors is an integer number (2081681406).

Almost surely, 2^28145229388 is an apocalyptic number.

It is an amenable number.

28145229388 is a deficient number, since it is larger than the sum of its proper divisors (21815124356).

28145229388 is a wasteful number, since it uses less digits than its factorization.

28145229388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 289353 (or 289351 counting only the distinct ones).

The product of its digits is 2211840, while the sum is 52.

The spelling of 28145229388 in words is "twenty-eight billion, one hundred forty-five million, two hundred twenty-nine thousand, three hundred eighty-eight".