28686374387 has 16 divisors (see below), whose sum is σ = 32668005888. Its totient is φ = 24934620480.

The previous prime is 28686374329. The next prime is 28686374411. The reversal of 28686374387 is 78347368682.

It is not a de Polignac number, because 28686374387 - 2⁶ = 28686374323 is a prime.

It is a super-2 number, since 2×28686374387² (a number of 22 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (28686374687) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 644618 + ... + 687680.

It is an arithmetic number, because the mean of its divisors is an integer number (2041750368).

Almost surely, 2^28686374387 is an apocalyptic number.

28686374387 is a deficient number, since it is larger than the sum of its proper divisors (3981631501).

28686374387 is a wasteful number, since it uses less digits than its factorization.

28686374387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45730.

The product of its digits is 65028096, while the sum is 62.

The spelling of 28686374387 in words is "twenty-eight billion, six hundred eighty-six million, three hundred seventy-four thousand, three hundred eighty-seven".