28755161728 has 64 divisors (see below), whose sum is σ = 58903929000. Its totient is φ = 13974077440.

The previous prime is 28755161723. The next prime is 28755161737. The reversal of 28755161728 is 82716155782.

It can be written as a sum of positive squares in 4 ways, for example, as 13122160704 + 15633001024 = 114552^2 + 125032^2 .

It is a tau number, because it is divible by the number of its divisors (64).

It is not an unprimeable number, because it can be changed into a prime (28755161723) 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, 1401528 + ... + 1421896.

Almost surely, 2^28755161728 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 28755161728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29451964500).

28755161728 is an abundant number, since it is smaller than the sum of its proper divisors (30148767272).

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

28755161728 is a wasteful number, since it uses less digits than its factorization.

28755161728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 20693 (or 20681 counting only the distinct ones).

The product of its digits is 1881600, while the sum is 52.

The spelling of 28755161728 in words is "twenty-eight billion, seven hundred fifty-five million, one hundred sixty-one thousand, seven hundred twenty-eight".