280397268 has 48 divisors (see below), whose sum is σ = 733656000. Its totient is φ = 92604384.

The previous prime is 280397239. The next prime is 280397279. The reversal of 280397268 is 862793082.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 138 + ... + 23681.

It is an arithmetic number, because the mean of its divisors is an integer number (15284500).

Almost surely, 2^280397268 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 280397268, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (366828000).

280397268 is an abundant number, since it is smaller than the sum of its proper divisors (453258732).

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

280397268 is a wasteful number, since it uses less digits than its factorization.

280397268 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23941 (or 23933 counting only the distinct ones).

The product of its (nonzero) digits is 290304, while the sum is 45.

The square root of 280397268 is about 16745.0669750825. The cubic root of 280397268 is about 654.5225181988.

The spelling of 280397268 in words is "two hundred eighty million, three hundred ninety-seven thousand, two hundred sixty-eight".