28065161987 has 4 divisors (see below), whose sum is σ = 28185613560. Its totient is φ = 27944710416.

The previous prime is 28065161983. The next prime is 28065162023. The reversal of 28065161987 is 78916156082.

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

It is a cyclic number.

It is not a de Polignac number, because 28065161987 - 2² = 28065161983 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28065161983) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 60225437 + ... + 60225902.

It is an arithmetic number, because the mean of its divisors is an integer number (7046403390).

Almost surely, 2^28065161987 is an apocalyptic number.

28065161987 is a deficient number, since it is larger than the sum of its proper divisors (120451573).

28065161987 is a wasteful number, since it uses less digits than its factorization.

28065161987 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 120451572.

The product of its (nonzero) digits is 1451520, while the sum is 53.

The spelling of 28065161987 in words is "twenty-eight billion, sixty-five million, one hundred sixty-one thousand, nine hundred eighty-seven".