280309248 has 140 divisors (see below), whose sum is σ = 840840528. Its totient is φ = 93312000.

The previous prime is 280309241. The next prime is 280309279. The reversal of 280309248 is 842903082.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280309241) by changing a digit.

It is a polite number, since it can be written in 13 ways as a sum of consecutive naturals, for example, 372873 + ... + 373623.

Almost surely, 2^280309248 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 280309248, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (420420264).

280309248 is an abundant number, since it is smaller than the sum of its proper divisors (560531280).

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

280309248 is an frugal number, since it uses more digits than its factorization.

280309248 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 787 (or 756 counting only the distinct ones).

The product of its (nonzero) digits is 27648, while the sum is 36.

The square root of 280309248 is about 16742.4385320658. The cubic root of 280309248 is about 654.4540235926.

The spelling of 280309248 in words is "two hundred eighty million, three hundred nine thousand, two hundred forty-eight".