28321388156 has 12 divisors (see below), whose sum is σ = 49564980192. Its totient is φ = 14159965248.

The previous prime is 28321388143. The next prime is 28321388191. The reversal of 28321388156 is 65188312382.

It is a self number, because there is not a number n which added to its sum of digits gives 28321388156.

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, 89540 + ... + 254283.

It is an arithmetic number, because the mean of its divisors is an integer number (4130415016).

Almost surely, 2^28321388156 is an apocalyptic number.

It is an amenable number.

28321388156 is a deficient number, since it is larger than the sum of its proper divisors (21243592036).

28321388156 is a wasteful number, since it uses less digits than its factorization.

28321388156 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 364420 (or 364418 counting only the distinct ones).

The product of its digits is 552960, while the sum is 47.

The spelling of 28321388156 in words is "twenty-eight billion, three hundred twenty-one million, three hundred eighty-eight thousand, one hundred fifty-six".