28005775580 has 24 divisors (see below), whose sum is σ = 59921793792. Its totient is φ = 10990945472.

The previous prime is 28005775579. The next prime is 28005775661. The reversal of 28005775580 is 8557750082.

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, 13209212 + ... + 13211331.

It is an arithmetic number, because the mean of its divisors is an integer number (2496741408).

Almost surely, 2^28005775580 is an apocalyptic number.

28005775580 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28005775580 is an abundant number, since it is smaller than the sum of its proper divisors (31916018212).

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

28005775580 is a wasteful number, since it uses less digits than its factorization.

28005775580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26420605 (or 26420603 counting only the distinct ones).

The product of its (nonzero) digits is 784000, while the sum is 47.

The spelling of 28005775580 in words is "twenty-eight billion, five million, seven hundred seventy-five thousand, five hundred eighty".