28645009128 has 96 divisors (see below), whose sum is σ = 81166176000. Its totient is φ = 9463765248.

The previous prime is 28645009123. The next prime is 28645009147. The reversal of 28645009128 is 82190054682.

It is not an unprimeable number, because it can be changed into a prime (28645009123) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 154473 + ... + 284871.

It is an arithmetic number, because the mean of its divisors is an integer number (845481000).

Almost surely, 2^28645009128 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 28645009128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40583088000).

28645009128 is an abundant number, since it is smaller than the sum of its proper divisors (52521166872).

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

28645009128 is a wasteful number, since it uses less digits than its factorization.

28645009128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 130533 (or 130517 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 28645009128 in words is "twenty-eight billion, six hundred forty-five million, nine thousand, one hundred twenty-eight".