280985887 has 8 divisors (see below), whose sum is σ = 345828896. Its totient is φ = 222318432.

The previous prime is 280985867. The next prime is 280985893. The reversal of 280985887 is 788589082.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 280985887 - 2²³ = 272597279 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (280985827) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1543788 + ... + 1543969.

It is an arithmetic number, because the mean of its divisors is an integer number (43228612).

Almost surely, 2^280985887 is an apocalyptic number.

280985887 is a deficient number, since it is larger than the sum of its proper divisors (64843009).

280985887 is a wasteful number, since it uses less digits than its factorization.

280985887 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3087777.

The product of its (nonzero) digits is 2580480, while the sum is 55.

The square root of 280985887 is about 16762.6336534567. The cubic root of 280985887 is about 654.9801963595.

The spelling of 280985887 in words is "two hundred eighty million, nine hundred eighty-five thousand, eight hundred eighty-seven".