280988 has 12 divisors (see below), whose sum is σ = 495600. Its totient is φ = 139392.

The previous prime is 280979. The next prime is 280997. The reversal of 280988 is 889082.

It is an interprime number because it is at equal distance from previous prime (280979) and next prime (280997).

It is a super-2 number, since 2×280988² = 157908512288, which contains 22 as substring.

It is a plaindrome in base 16.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 280988.

It is an unprimeable number.

280988 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 620 + ... + 972.

It is an arithmetic number, because the mean of its divisors is an integer number (41300).

2²⁸⁰⁹⁸⁸ is an apocalyptic number.

It is an amenable number.

280988 is a deficient number, since it is larger than the sum of its proper divisors (214612).

280988 is a wasteful number, since it uses less digits than its factorization.

280988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 556 (or 554 counting only the distinct ones).

The product of its (nonzero) digits is 9216, while the sum is 35.

The square root of 280988 is about 530.0830123669. The cubic root of 280988 is about 65.4981838162.

The spelling of 280988 in words is "two hundred eighty thousand, nine hundred eighty-eight".