280859985 has 48 divisors (see below), whose sum is σ = 566901504. Its totient is φ = 125963136.

The previous prime is 280859959. The next prime is 280860011. The reversal of 280859985 is 589958082.

It is an interprime number because it is at equal distance from previous prime (280859959) and next prime (280860011).

It is not a de Polignac number, because 280859985 - 2¹² = 280855889 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 8284 + ... + 25106.

It is an arithmetic number, because the mean of its divisors is an integer number (11810448).

Almost surely, 2^280859985 is an apocalyptic number.

It is an amenable number.

280859985 is an abundant number, since it is smaller than the sum of its proper divisors (286041519).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

280859985 is a wasteful number, since it uses less digits than its factorization.

280859985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16894 (or 16891 counting only the distinct ones).

The product of its (nonzero) digits is 2073600, while the sum is 54.

The square root of 280859985 is about 16758.8777965591. The cubic root of 280859985 is about 654.8823555780.

The spelling of 280859985 in words is "two hundred eighty million, eight hundred fifty-nine thousand, nine hundred eighty-five".