8921285280 has 72 divisors (see below), whose sum is σ = 30443890932. Its totient is φ = 2379009024.

The previous prime is 8921285239. The next prime is 8921285297. The reversal of 8921285280 is 825821298.

8921285280 is a `hidden beast` number, since 8 + 92 + 1 + 285 + 280 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 8921180304 + 104976 = 94452^2 + 324^2 .

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (45).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3096229 + ... + 3099108.

Almost surely, 2^8921285280 is an apocalyptic number.

8921285280 is a gapful number since it is divisible by the number (80) formed by its first and last digit.

It is an amenable number.

8921285280 is an abundant number, since it is smaller than the sum of its proper divisors (21522605652).

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

8921285280 is a wasteful number, since it uses less digits than its factorization.

8921285280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6195358 (or 6195347 counting only the distinct ones).

The product of its (nonzero) digits is 184320, while the sum is 45.

The square root of 8921285280 is about 94452.5557092025. Note that the first 3 decimals coincide. The cubic root of 8921285280 is about 2074.0018641646.

The spelling of 8921285280 in words is "eight billion, nine hundred twenty-one million, two hundred eighty-five thousand, two hundred eighty".