28387432186 has 16 divisors (see below), whose sum is σ = 44456284800. Its totient is φ = 13569331248.

The previous prime is 28387432141. The next prime is 28387432207. The reversal of 28387432186 is 68123478382.

It is a happy number.

It is a super-2 number, since 2×28387432186² (a number of 22 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77781 + ... + 250648.

It is an arithmetic number, because the mean of its divisors is an integer number (2778517800).

Almost surely, 2^28387432186 is an apocalyptic number.

28387432186 is a deficient number, since it is larger than the sum of its proper divisors (16068852614).

28387432186 is a wasteful number, since it uses less digits than its factorization.

28387432186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 330333.

The product of its digits is 3096576, while the sum is 52.

The spelling of 28387432186 in words is "twenty-eight billion, three hundred eighty-seven million, four hundred thirty-two thousand, one hundred eighty-six".