28136905252 has 6 divisors (see below), whose sum is σ = 49239584198. Its totient is φ = 14068452624.

The previous prime is 28136905229. The next prime is 28136905301. The reversal of 28136905252 is 25250963182.

It can be written as a sum of positive squares in only one way, i.e., 18231480576 + 9905424676 = 135024^2 + 99526^2 .

It is a junction number, because it is equal to n+sod(n) for n = 28136905199 and 28136905208.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3517113153 + ... + 3517113160.

Almost surely, 2^28136905252 is an apocalyptic number.

It is an amenable number.

28136905252 is a deficient number, since it is larger than the sum of its proper divisors (21102678946).

28136905252 is a wasteful number, since it uses less digits than its factorization.

28136905252 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7034226317 (or 7034226315 counting only the distinct ones).

The product of its (nonzero) digits is 259200, while the sum is 43.

The spelling of 28136905252 in words is "twenty-eight billion, one hundred thirty-six million, nine hundred five thousand, two hundred fifty-two".