280505253 has 24 divisors (see below), whose sum is σ = 460665792. Its totient is φ = 150858624.

The previous prime is 280505249. The next prime is 280505261. The reversal of 280505253 is 352505082.

It is not a de Polignac number, because 280505253 - 2² = 280505249 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 280505253.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280505213) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53625 + ... + 58622.

It is an arithmetic number, because the mean of its divisors is an integer number (19194408).

Almost surely, 2^280505253 is an apocalyptic number.

It is an amenable number.

280505253 is a deficient number, since it is larger than the sum of its proper divisors (180160539).

280505253 is a wasteful number, since it uses less digits than its factorization.

280505253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112281 (or 112274 counting only the distinct ones).

The product of its (nonzero) digits is 12000, while the sum is 30.

The square root of 280505253 is about 16748.2910471487. The cubic root of 280505253 is about 654.6065294108.

The spelling of 280505253 in words is "two hundred eighty million, five hundred five thousand, two hundred fifty-three".