28130981536 has 36 divisors (see below), whose sum is σ = 64424974698. Its totient is φ = 12056134272.

The previous prime is 28130981521. The next prime is 28130981537. The reversal of 28130981536 is 63518903182.

It can be written as a sum of positive squares in only one way, i.e., 26583345936 + 1547635600 = 163044^2 + 39340^2 .

It is not an unprimeable number, because it can be changed into a prime (28130981537) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 8968771 + ... + 8971906.

Almost surely, 2^28130981536 is an apocalyptic number.

It is an amenable number.

28130981536 is an abundant number, since it is smaller than the sum of its proper divisors (36293993162).

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

28130981536 is a wasteful number, since it uses less digits than its factorization.

28130981536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17940701 (or 17940686 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 46.

The spelling of 28130981536 in words is "twenty-eight billion, one hundred thirty million, nine hundred eighty-one thousand, five hundred thirty-six".