280565040 has 320 divisors, whose sum is σ = 1064503296. Its totient is φ = 59744256.

The previous prime is 280564961. The next prime is 280565041. The reversal of 280565040 is 40565082.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 280564989 and 280565007.

It is not an unprimeable number, because it can be changed into a prime (280565041) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 2047852 + ... + 2047988.

Almost surely, 2^280565040 is an apocalyptic number.

280565040 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 280565040, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (532251648).

280565040 is an abundant number, since it is smaller than the sum of its proper divisors (783938256).

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

280565040 is a wasteful number, since it uses less digits than its factorization.

280565040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 236 (or 230 counting only the distinct ones).

The product of its (nonzero) digits is 9600, while the sum is 30.

The square root of 280565040 is about 16750.0758207239. The cubic root of 280565040 is about 654.6530338047.

The spelling of 280565040 in words is "two hundred eighty million, five hundred sixty-five thousand, forty".