28355984580 has 576 divisors, whose sum is σ = 105706782720. Its totient is φ = 5550336000.

The previous prime is 28355984561. The next prime is 28355984633. The reversal of 28355984580 is 8548955382.

It is a self number, because there is not a number n which added to its sum of digits gives 28355984580.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 64592001 + ... + 64592439.

It is an arithmetic number, because the mean of its divisors is an integer number (183518720).

Almost surely, 2^28355984580 is an apocalyptic number.

28355984580 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 28355984580, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (52853391360).

28355984580 is an abundant number, since it is smaller than the sum of its proper divisors (77350798140).

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

28355984580 is a wasteful number, since it uses less digits than its factorization.

28355984580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 552 (or 539 counting only the distinct ones).

The product of its (nonzero) digits is 13824000, while the sum is 57.

The spelling of 28355984580 in words is "twenty-eight billion, three hundred fifty-five million, nine hundred eighty-four thousand, five hundred eighty".