280255872 has 128 divisors (see below), whose sum is σ = 828011520. Its totient is φ = 83404800.

The previous prime is 280255867. The next prime is 280255873. The reversal of 280255872 is 278552082.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a self number, because there is not a number n which added to its sum of digits gives 280255872.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280255873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 153847 + ... + 155657.

It is an arithmetic number, because the mean of its divisors is an integer number (6468840).

Almost surely, 2^280255872 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 280255872, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (414005760).

280255872 is an abundant number, since it is smaller than the sum of its proper divisors (547755648).

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

280255872 is a wasteful number, since it uses less digits than its factorization.

280255872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1872 (or 1860 counting only the distinct ones).

The product of its (nonzero) digits is 89600, while the sum is 39.

The square root of 280255872 is about 16740.8444231466. The cubic root of 280255872 is about 654.4124809563.

The spelling of 280255872 in words is "two hundred eighty million, two hundred fifty-five thousand, eight hundred seventy-two".