28136036644 has 9 divisors (see below), whose sum is σ = 49238651217. Its totient is φ = 14067850584.

The previous prime is 28136036641. The next prime is 28136036647. The reversal of 28136036644 is 44663063182.

The square root of 28136036644 is 167738.

It is a perfect power (a square), and thus also a powerful number.

It is an interprime number because it is at equal distance from previous prime (28136036641) and next prime (28136036647).

It can be written as a sum of positive squares in only one way, i.e., 3461910244 + 24674126400 = 58838^2 + 157080^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 28136036644.

It is not an unprimeable number, because it can be changed into a prime (28136036641) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 293542 + ... + 377410.

Almost surely, 2^28136036644 is an apocalyptic number.

28136036644 is the 167738-th square number.

It is an amenable number.

28136036644 is a deficient number, since it is larger than the sum of its proper divisors (21102614573).

28136036644 is an frugal number, since it uses more digits than its factorization.

28136036644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167742 (or 83871 counting only the distinct ones).

The product of its (nonzero) digits is 497664, while the sum is 43.

The spelling of 28136036644 in words is "twenty-eight billion, one hundred thirty-six million, thirty-six thousand, six hundred forty-four".