28128764740 has 96 divisors (see below), whose sum is σ = 63659965824. Its totient is φ = 10402375680.

The previous prime is 28128764731. The next prime is 28128764743. The reversal of 28128764740 is 4746782182.

It is not an unprimeable number, because it can be changed into a prime (28128764743) 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, 5105067 + ... + 5110573.

It is an arithmetic number, because the mean of its divisors is an integer number (663124644).

Almost surely, 2^28128764740 is an apocalyptic number.

28128764740 is a gapful number since it is divisible by the number (20) 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 28128764740, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31829982912).

28128764740 is an abundant number, since it is smaller than the sum of its proper divisors (35531201084).

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

28128764740 is a wasteful number, since it uses less digits than its factorization.

28128764740 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5797 (or 5795 counting only the distinct ones).

The product of its (nonzero) digits is 1204224, while the sum is 49.

The spelling of 28128764740 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred sixty-four thousand, seven hundred forty".