280118887 has 2 divisors, whose sum is σ = 280118888. Its totient is φ = 280118886.

The previous prime is 280118869. The next prime is 280118921. The reversal of 280118887 is 788811082.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 280118887 - 2¹⁵ = 280086119 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (280118807) 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 as a sum of consecutive naturals, namely, 140059443 + 140059444.

It is an arithmetic number, because the mean of its divisors is an integer number (140059444).

Almost surely, 2^280118887 is an apocalyptic number.

280118887 is a deficient number, since it is larger than the sum of its proper divisors (1).

280118887 is an equidigital number, since it uses as much as digits as its factorization.

280118887 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 57344, while the sum is 43.

The square root of 280118887 is about 16736.7525822664. The cubic root of 280118887 is about 654.3058411409.

The spelling of 280118887 in words is "two hundred eighty million, one hundred eighteen thousand, eight hundred eighty-seven".