280504087 has 4 divisors (see below), whose sum is σ = 295267480. Its totient is φ = 265740696.

The previous prime is 280504057. The next prime is 280504099. The reversal of 280504087 is 780405082.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 280504087 - 2⁷ = 280503959 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280504057) 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 3 ways as a sum of consecutive naturals, for example, 7381668 + ... + 7381705.

It is an arithmetic number, because the mean of its divisors is an integer number (73816870).

Almost surely, 2^280504087 is an apocalyptic number.

280504087 is a deficient number, since it is larger than the sum of its proper divisors (14763393).

280504087 is a wasteful number, since it uses less digits than its factorization.

280504087 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14763392.

The product of its (nonzero) digits is 17920, while the sum is 34.

The square root of 280504087 is about 16748.2562375908. The cubic root of 280504087 is about 654.6056223900.

The spelling of 280504087 in words is "two hundred eighty million, five hundred four thousand, eighty-seven".