280423312 has 40 divisors (see below), whose sum is σ = 588571704. Its totient is φ = 128661504.

The previous prime is 280423309. The next prime is 280423331. The reversal of 280423312 is 213324082.

It can be written as a sum of positive squares in 4 ways, for example, as 130507776 + 149915536 = 11424^2 + 12244^2 .

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, 32088 + ... + 39880.

Almost surely, 2^280423312 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 280423312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (294285852).

280423312 is an abundant number, since it is smaller than the sum of its proper divisors (308148392).

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

280423312 is a wasteful number, since it uses less digits than its factorization.

280423312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7987 (or 7981 counting only the distinct ones).

The product of its (nonzero) digits is 2304, while the sum is 25.

The square root of 280423312 is about 16745.8446188898. The cubic root of 280423312 is about 654.5427821346.

Adding to 280423312 its reverse (213324082), we get a palindrome (493747394).

The spelling of 280423312 in words is "two hundred eighty million, four hundred twenty-three thousand, three hundred twelve".