280204540 has 216 divisors, whose sum is σ = 802373040. Its totient is φ = 81607680.

The previous prime is 280204531. The next prime is 280204543. The reversal of 280204540 is 45402082.

It is a happy number.

It is a super-2 number, since 2×280204540² = 157029168473223200, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280204543) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 2015791 + ... + 2015929.

It is an arithmetic number, because the mean of its divisors is an integer number (3714690).

Almost surely, 2^280204540 is an apocalyptic number.

280204540 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 280204540, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (401186520).

280204540 is an abundant number, since it is smaller than the sum of its proper divisors (522168500).

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

280204540 is a wasteful number, since it uses less digits than its factorization.

280204540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 201 (or 181 counting only the distinct ones).

The product of its (nonzero) digits is 2560, while the sum is 25.

The square root of 280204540 is about 16739.3112164151. The cubic root of 280204540 is about 654.3725241930.

The spelling of 280204540 in words is "two hundred eighty million, two hundred four thousand, five hundred forty".