280105328 has 40 divisors (see below), whose sum is σ = 577007712. Its totient is φ = 131268608.

The previous prime is 280105313. The next prime is 280105369. The reversal of 280105328 is 823501082.

It is a self number, because there is not a number n which added to its sum of digits gives 280105328.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 67901 + ... + 71907.

Almost surely, 2^280105328 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 280105328, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (288503856).

280105328 is an abundant number, since it is smaller than the sum of its proper divisors (296902384).

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

280105328 is a wasteful number, since it uses less digits than its factorization.

280105328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4289 (or 4283 counting only the distinct ones).

The product of its (nonzero) digits is 3840, while the sum is 29.

The square root of 280105328 is about 16736.3475107324. The cubic root of 280105328 is about 654.2952838663.

The spelling of 280105328 in words is "two hundred eighty million, one hundred five thousand, three hundred twenty-eight".