280325856 has 96 divisors (see below), whose sum is σ = 765773568. Its totient is φ = 89717760.

The previous prime is 280325849. The next prime is 280325879. The reversal of 280325856 is 658523082.

It is a tau number, because it is divible by the number of its divisors (96).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 263181 + ... + 264243.

It is an arithmetic number, because the mean of its divisors is an integer number (7976808).

Almost surely, 2^280325856 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 280325856, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (382886784).

280325856 is an abundant number, since it is smaller than the sum of its proper divisors (485447712).

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

280325856 is a wasteful number, since it uses less digits than its factorization.

280325856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1184 (or 1176 counting only the distinct ones).

The product of its (nonzero) digits is 115200, while the sum is 39.

The square root of 280325856 is about 16742.9345098164. The cubic root of 280325856 is about 654.4669485530.

The spelling of 280325856 in words is "two hundred eighty million, three hundred twenty-five thousand, eight hundred fifty-six".