28081660807 has 4 divisors (see below), whose sum is σ = 28083203176. Its totient is φ = 28080118440.

The previous prime is 28081660787. The next prime is 28081660811. The reversal of 28081660807 is 70806618082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-28081660807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28081660007) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 743544 + ... + 780397.

It is an arithmetic number, because the mean of its divisors is an integer number (7020800794).

Almost surely, 2^28081660807 is an apocalyptic number.

28081660807 is a deficient number, since it is larger than the sum of its proper divisors (1542369).

28081660807 is a wasteful number, since it uses less digits than its factorization.

28081660807 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1542368.

The product of its (nonzero) digits is 258048, while the sum is 46.

The spelling of 28081660807 in words is "twenty-eight billion, eighty-one million, six hundred sixty thousand, eight hundred seven".