28078261728 has 192 divisors, whose sum is σ = 82402790400. Its totient is φ = 8298547200.

The previous prime is 28078261723. The next prime is 28078261787. The reversal of 28078261728 is 82716287082.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28078261721) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 17320758 + ... + 17322378.

It is an arithmetic number, because the mean of its divisors is an integer number (429181200).

Almost surely, 2^28078261728 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 28078261728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41201395200).

28078261728 is an abundant number, since it is smaller than the sum of its proper divisors (54324528672).

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

28078261728 is a wasteful number, since it uses less digits than its factorization.

28078261728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2041 (or 2033 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 51.

The spelling of 28078261728 in words is "twenty-eight billion, seventy-eight million, two hundred sixty-one thousand, seven hundred twenty-eight".