28081802312 has 8 divisors (see below), whose sum is σ = 52653379350. Its totient is φ = 14040901152.

The previous prime is 28081802311. The next prime is 28081802317. The reversal of 28081802312 is 21320818082.

It can be written as a sum of positive squares in only one way, i.e., 18134931556 + 9946870756 = 134666^2 + 99734^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is not an unprimeable number, because it can be changed into a prime (28081802311) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1755112637 + ... + 1755112652.

Almost surely, 2^28081802312 is an apocalyptic number.

It is an amenable number.

28081802312 is a deficient number, since it is larger than the sum of its proper divisors (24571577038).

28081802312 is a wasteful number, since it uses less digits than its factorization.

28081802312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3510225295 (or 3510225291 counting only the distinct ones).

The product of its (nonzero) digits is 12288, while the sum is 35.

The spelling of 28081802312 in words is "twenty-eight billion, eighty-one million, eight hundred two thousand, three hundred twelve".