28001685089 has 12 divisors (see below), whose sum is σ = 33367864068. Its totient is φ = 23416041600.

The previous prime is 28001684993. The next prime is 28001685091. The reversal of 28001685089 is 98058610082.

It can be written as a sum of positive squares in 2 ways, for example, as 9664462864 + 18337222225 = 98308^2 + 135415^2 .

It is a de Polignac number, because none of the positive numbers 2^k-28001685089 is a prime.

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (28001685289) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6967052 + ... + 6971069.

It is an arithmetic number, because the mean of its divisors is an integer number (2780655339).

Almost surely, 2^28001685089 is an apocalyptic number.

It is an amenable number.

28001685089 is a deficient number, since it is larger than the sum of its proper divisors (5366178979).

28001685089 is a wasteful number, since it uses less digits than its factorization.

28001685089 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13938176 (or 13938169 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 47.

The spelling of 28001685089 in words is "twenty-eight billion, one million, six hundred eighty-five thousand, eighty-nine".