28787859138 has 16 divisors (see below), whose sum is σ = 57608696160. Its totient is φ = 9590456736.

The previous prime is 28787859119. The next prime is 28787859151. The reversal of 28787859138 is 83195878782.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1362723 + ... + 1383686.

It is an arithmetic number, because the mean of its divisors is an integer number (3600543510).

Almost surely, 2^28787859138 is an apocalyptic number.

28787859138 is an abundant number, since it is smaller than the sum of its proper divisors (28820837022).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

28787859138 is a wasteful number, since it uses less digits than its factorization.

28787859138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2748161.

The product of its digits is 54190080, while the sum is 66.

The spelling of 28787859138 in words is "twenty-eight billion, seven hundred eighty-seven million, eight hundred fifty-nine thousand, one hundred thirty-eight".