28512648138 has 16 divisors (see below), whose sum is σ = 61411857696. Its totient is φ = 8773122480.

The previous prime is 28512648097. The next prime is 28512648139. The reversal of 28512648138 is 83184621582.

It is a super-2 number, since 2×28512648138² (a number of 22 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28512648139) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 182773308 + ... + 182773463.

It is an arithmetic number, because the mean of its divisors is an integer number (3838241106).

Almost surely, 2^28512648138 is an apocalyptic number.

28512648138 is an abundant number, since it is smaller than the sum of its proper divisors (32899209558).

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

28512648138 is a wasteful number, since it uses less digits than its factorization.

28512648138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365546789.

The product of its digits is 737280, while the sum is 48.

The spelling of 28512648138 in words is "twenty-eight billion, five hundred twelve million, six hundred forty-eight thousand, one hundred thirty-eight".