280397712 has 80 divisors (see below), whose sum is σ = 834486272. Its totient is φ = 79470720.

The previous prime is 280397707. The next prime is 280397717. The reversal of 280397712 is 217793082.

It is an interprime number because it is at equal distance from previous prime (280397707) and next prime (280397717).

It is not an unprimeable number, because it can be changed into a prime (280397717) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 39387 + ... + 45957.

Almost surely, 2^280397712 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 280397712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (417243136).

280397712 is an abundant number, since it is smaller than the sum of its proper divisors (554088560).

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

280397712 is a wasteful number, since it uses less digits than its factorization.

280397712 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6716 (or 6710 counting only the distinct ones).

The product of its (nonzero) digits is 42336, while the sum is 39.

The square root of 280397712 is about 16745.0802327131. The cubic root of 280397712 is about 654.5228636704.

The spelling of 280397712 in words is "two hundred eighty million, three hundred ninety-seven thousand, seven hundred twelve".