280065280 has 72 divisors (see below), whose sum is σ = 731866464. Its totient is φ = 101836800.

The previous prime is 280065257. The next prime is 280065299. The reversal of 280065280 is 82560082.

It is a super-2 number, since 2×280065280² = 156873122122956800, which contains 22 as substring.

It is a congruent number.

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, 4135 + ... + 24025.

It is an arithmetic number, because the mean of its divisors is an integer number (10164812).

Almost surely, 2^280065280 is an apocalyptic number.

280065280 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 280065280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (365933232).

280065280 is an abundant number, since it is smaller than the sum of its proper divisors (451801184).

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

280065280 is a wasteful number, since it uses less digits than its factorization.

280065280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19923 (or 19909 counting only the distinct ones).

The product of its (nonzero) digits is 7680, while the sum is 31.

The square root of 280065280 is about 16735.1510300923. The cubic root of 280065280 is about 654.2640998035.

The spelling of 280065280 in words is "two hundred eighty million, sixty-five thousand, two hundred eighty".