28328729188 has 6 divisors (see below), whose sum is σ = 49575276086. Its totient is φ = 14164364592.

The previous prime is 28328729179. The next prime is 28328729239. The reversal of 28328729188 is 88192782382.

It can be written as a sum of positive squares in only one way, i.e., 23228198464 + 5100530724 = 152408^2 + 71418^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3541091145 + ... + 3541091152.

Almost surely, 2^28328729188 is an apocalyptic number.

It is an amenable number.

28328729188 is a deficient number, since it is larger than the sum of its proper divisors (21246546898).

28328729188 is a wasteful number, since it uses less digits than its factorization.

28328729188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7082182301 (or 7082182299 counting only the distinct ones).

The product of its digits is 6193152, while the sum is 58.

The spelling of 28328729188 in words is "twenty-eight billion, three hundred twenty-eight million, seven hundred twenty-nine thousand, one hundred eighty-eight".