28509085520 has 40 divisors (see below), whose sum is σ = 68421811200. Its totient is φ = 11035774080.

The previous prime is 28509085499. The next prime is 28509085523. The reversal of 28509085520 is 2558090582.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28509085523) 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, 5745320 + ... + 5750279.

It is an arithmetic number, because the mean of its divisors is an integer number (1710545280).

Almost surely, 2^28509085520 is an apocalyptic number.

28509085520 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28509085520 is an abundant number, since it is smaller than the sum of its proper divisors (39912725680).

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

28509085520 is a wasteful number, since it uses less digits than its factorization.

28509085520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11495643 (or 11495637 counting only the distinct ones).

The product of its (nonzero) digits is 288000, while the sum is 44.

The spelling of 28509085520 in words is "twenty-eight billion, five hundred nine million, eighty-five thousand, five hundred twenty".