281980 has 24 divisors (see below), whose sum is σ = 618912. Its totient is φ = 107712.

The previous prime is 281971. The next prime is 281989. The reversal of 281980 is 89182.

It is an interprime number because it is at equal distance from previous prime (281971) and next prime (281989).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281989) by changing a digit.

281980 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 7 ways as a sum of consecutive naturals, for example, 154 + ... + 766.

It is an arithmetic number, because the mean of its divisors is an integer number (25788).

2²⁸¹⁹⁸⁰ is an apocalyptic number.

281980 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (309456).

281980 is an abundant number, since it is smaller than the sum of its proper divisors (336932).

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

281980 is a wasteful number, since it uses less digits than its factorization.

281980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 645 (or 643 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 28.

The square root of 281980 is about 531.0178904707. The cubic root of 281980 is about 65.5751715479.

The spelling of 281980 in words is "two hundred eighty-one thousand, nine hundred eighty".