28081645012 has 12 divisors (see below), whose sum is σ = 49144054036. Its totient is φ = 14040486720.

The previous prime is 28081645003. The next prime is 28081645013. The reversal of 28081645012 is 21054618082.

It can be written as a sum of positive squares in 2 ways, for example, as 7950575556 + 20131069456 = 89166^2 + 141884^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081645013) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 270568 + ... + 359680.

Almost surely, 2^28081645012 is an apocalyptic number.

It is an amenable number.

28081645012 is a deficient number, since it is larger than the sum of its proper divisors (21062409024).

28081645012 is a wasteful number, since it uses less digits than its factorization.

28081645012 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167898 (or 167896 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 37.

The spelling of 28081645012 in words is "twenty-eight billion, eighty-one million, six hundred forty-five thousand, twelve".