280819985900 has 144 divisors (see below), whose sum is σ = 663929693280. Its totient is φ = 102695424000.

The previous prime is 280819985893. The next prime is 280819985933. The reversal of 280819985900 is 9589918082.

It is a self number, because there is not a number n which added to its sum of digits gives 280819985900.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 9084671 + ... + 9115529.

It is an arithmetic number, because the mean of its divisors is an integer number (4610622870).

Almost surely, 2^280819985900 is an apocalyptic number.

280819985900 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 280819985900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (331964846640).

280819985900 is an abundant number, since it is smaller than the sum of its proper divisors (383109707380).

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

280819985900 is a wasteful number, since it uses less digits than its factorization.

280819985900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31044 (or 31037 counting only the distinct ones).

The product of its (nonzero) digits is 3732480, while the sum is 59.

The spelling of 280819985900 in words is "two hundred eighty billion, eight hundred nineteen million, nine hundred eighty-five thousand, nine hundred".