28611028138 has 48 divisors (see below), whose sum is σ = 54008256960. Its totient is φ = 11127188160.

The previous prime is 28611028109. The next prime is 28611028151. The reversal of 28611028138 is 83182011682.

It is a super-4 number, since 4×28611028138⁴ (a number of 43 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a self number, because there is not a number n which added to its sum of digits gives 28611028138.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 949045 + ... + 978727.

It is an arithmetic number, because the mean of its divisors is an integer number (1125172020).

Almost surely, 2^28611028138 is an apocalyptic number.

28611028138 is a deficient number, since it is larger than the sum of its proper divisors (25397228822).

28611028138 is a wasteful number, since it uses less digits than its factorization.

28611028138 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 30283 (or 30272 counting only the distinct ones).

The product of its (nonzero) digits is 36864, while the sum is 40.

The spelling of 28611028138 in words is "twenty-eight billion, six hundred eleven million, twenty-eight thousand, one hundred thirty-eight".