280881072 has 120 divisors (see below), whose sum is σ = 838272240. Its totient is φ = 87490560.

The previous prime is 280881043. The next prime is 280881091. The reversal of 280881072 is 270188082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 437872 + ... + 438512.

It is an arithmetic number, because the mean of its divisors is an integer number (6985602).

Almost surely, 2^280881072 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280881072, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (419136120).

280881072 is an abundant number, since it is smaller than the sum of its proper divisors (557391168).

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

280881072 is a wasteful number, since it uses less digits than its factorization.

280881072 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 851 (or 842 counting only the distinct ones).

The product of its (nonzero) digits is 14336, while the sum is 36.

The square root of 280881072 is about 16759.5069139877. The cubic root of 280881072 is about 654.8987447154.

The spelling of 280881072 in words is "two hundred eighty million, eight hundred eighty-one thousand, seventy-two".