28944934656 has 432 divisors, whose sum is σ = 88784688384. Its totient is φ = 8357888000.

The previous prime is 28944934567. The next prime is 28944934657. The reversal of 28944934656 is 65643944982.

It is a self number, because there is not a number n which added to its sum of digits gives 28944934656.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28944934657) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 270513355 + ... + 270513461.

It is an arithmetic number, because the mean of its divisors is an integer number (205520112).

Almost surely, 2^28944934656 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28944934656, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (44392344192).

28944934656 is an abundant number, since it is smaller than the sum of its proper divisors (59839753728).

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

28944934656 is a wasteful number, since it uses less digits than its factorization.

28944934656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 260 (or 235 counting only the distinct ones).

The product of its digits is 44789760, while the sum is 60.

The spelling of 28944934656 in words is "twenty-eight billion, nine hundred forty-four million, nine hundred thirty-four thousand, six hundred fifty-six".