281242980 has 72 divisors (see below), whose sum is σ = 855271872. Its totient is φ = 74807616.

The previous prime is 281242961. The next prime is 281242991. The reversal of 281242980 is 89242182.

It is a super-2 number, since 2×281242980² = 158195227598560800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

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 in 23 ways as a sum of consecutive naturals, for example, 77977 + ... + 81503.

It is an arithmetic number, because the mean of its divisors is an integer number (11878776).

Almost surely, 2^281242980 is an apocalyptic number.

281242980 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 281242980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (427635936).

281242980 is an abundant number, since it is smaller than the sum of its proper divisors (574028892).

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

281242980 is a wasteful number, since it uses less digits than its factorization.

281242980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3985 (or 3980 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 36.

The square root of 281242980 is about 16770.3005339797. The cubic root of 281242980 is about 655.1798973648.

The spelling of 281242980 in words is "two hundred eighty-one million, two hundred forty-two thousand, nine hundred eighty".