28158522687 has 12 divisors (see below), whose sum is σ = 40824627480. Its totient is φ = 18702561168.

The previous prime is 28158522673. The next prime is 28158522703. The reversal of 28158522687 is 78622585182.

28158522687 is a `hidden beast` number, since 2 + 8 + 1 + 58 + 522 + 68 + 7 = 666.

It is a de Polignac number, because none of the positive numbers 2^k-28158522687 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28158522787) 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, 5813053 + ... + 5817894.

It is an arithmetic number, because the mean of its divisors is an integer number (3402052290).

Almost surely, 2^28158522687 is an apocalyptic number.

28158522687 is a deficient number, since it is larger than the sum of its proper divisors (12666104793).

28158522687 is a wasteful number, since it uses less digits than its factorization.

28158522687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11631222 (or 11631219 counting only the distinct ones).

The product of its digits is 4300800, while the sum is 54.

The spelling of 28158522687 in words is "twenty-eight billion, one hundred fifty-eight million, five hundred twenty-two thousand, six hundred eighty-seven".