28658672028 has 144 divisors (see below), whose sum is σ = 84794411520. Its totient is φ = 7992432000.

The previous prime is 28658672017. The next prime is 28658672087. The reversal of 28658672028 is 82027685682.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1799163 + ... + 1815021.

It is an arithmetic number, because the mean of its divisors is an integer number (588850080).

Almost surely, 2^28658672028 is an apocalyptic number.

28658672028 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28658672028, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (42397205760).

28658672028 is an abundant number, since it is smaller than the sum of its proper divisors (56135739492).

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

28658672028 is a wasteful number, since it uses less digits than its factorization.

28658672028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16048 (or 16043 counting only the distinct ones).

The product of its (nonzero) digits is 5160960, while the sum is 54.

The spelling of 28658672028 in words is "twenty-eight billion, six hundred fifty-eight million, six hundred seventy-two thousand, twenty-eight".