28686946536 has 24 divisors (see below), whose sum is σ = 77693813730. Its totient is φ = 9562315488.

The previous prime is 28686946499. The next prime is 28686946553. The reversal of 28686946536 is 63564968682.

28686946536 is a `hidden beast` number, since 2 + 8 + 6 + 8 + 6 + 94 + 6 + 536 = 666.

It can be written as a sum of positive squares in only one way, i.e., 26828474436 + 1858472100 = 163794^2 + 43110^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 199214835 + ... + 199214978.

Almost surely, 2^28686946536 is an apocalyptic number.

It is an amenable number.

28686946536 is an abundant number, since it is smaller than the sum of its proper divisors (49006867194).

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

28686946536 is a wasteful number, since it uses less digits than its factorization.

28686946536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 398429825 (or 398429818 counting only the distinct ones).

The product of its digits is 89579520, while the sum is 63.

The spelling of 28686946536 in words is "twenty-eight billion, six hundred eighty-six million, nine hundred forty-six thousand, five hundred thirty-six".