280647960 has 128 divisors (see below), whose sum is σ = 893030400. Its totient is φ = 70433280.

The previous prime is 280647959. The next prime is 280647967. The reversal of 280647960 is 69746082.

280647960 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Smith number, since the sum of its digits (42) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280647967) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 136621 + ... + 138659.

It is an arithmetic number, because the mean of its divisors is an integer number (6976800).

Almost surely, 2^280647960 is an apocalyptic number.

280647960 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 280647960, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (446515200).

280647960 is an abundant number, since it is smaller than the sum of its proper divisors (612382440).

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

280647960 is a wasteful number, since it uses less digits than its factorization.

280647960 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2121 (or 2117 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 42.

The square root of 280647960 is about 16752.5508505421. The cubic root of 280647960 is about 654.7175209110.

The spelling of 280647960 in words is "two hundred eighty million, six hundred forty-seven thousand, nine hundred sixty".