280385253 has 32 divisors (see below), whose sum is σ = 431222400. Its totient is φ = 179843328.

The previous prime is 280385251. The next prime is 280385257. The reversal of 280385253 is 352583082.

280385253 is a `hidden beast` number, since 28 + 0 + 385 + 253 = 666.

It is not a de Polignac number, because 280385253 - 2¹ = 280385251 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280385251) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 338626 + ... + 339452.

It is an arithmetic number, because the mean of its divisors is an integer number (13475700).

Almost surely, 2^280385253 is an apocalyptic number.

It is an amenable number.

280385253 is a deficient number, since it is larger than the sum of its proper divisors (150837147).

280385253 is a wasteful number, since it uses less digits than its factorization.

280385253 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1298 (or 1292 counting only the distinct ones).

The product of its (nonzero) digits is 57600, while the sum is 36.

The square root of 280385253 is about 16744.7082088641. The cubic root of 280385253 is about 654.5131693198.

The spelling of 280385253 in words is "two hundred eighty million, three hundred eighty-five thousand, two hundred fifty-three".