28128758480 has 40 divisors (see below), whose sum is σ = 66994477704. Its totient is φ = 10977075200.

The previous prime is 28128758479. The next prime is 28128758531. The reversal of 28128758480 is 8485782182.

It can be written as a sum of positive squares in 4 ways, for example, as 2080089664 + 26048668816 = 45608^2 + 161396^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4284641 + ... + 4291200.

Almost surely, 2^28128758480 is an apocalyptic number.

28128758480 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28128758480 is an abundant number, since it is smaller than the sum of its proper divisors (38865719224).

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

28128758480 is a wasteful number, since it uses less digits than its factorization.

28128758480 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8575895 (or 8575889 counting only the distinct ones).

The product of its (nonzero) digits is 2293760, while the sum is 53.

The spelling of 28128758480 in words is "twenty-eight billion, one hundred twenty-eight million, seven hundred fifty-eight thousand, four hundred eighty".