281989072 has 20 divisors (see below), whose sum is σ = 553840420. Its totient is φ = 139062528.

The previous prime is 281989063. The next prime is 281989087. The reversal of 281989072 is 270989182.

It can be written as a sum of positive squares in 2 ways, for example, as 111007296 + 170981776 = 10536^2 + 13076^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 119547 + ... + 121882.

It is an arithmetic number, because the mean of its divisors is an integer number (27692021).

Almost surely, 2^281989072 is an apocalyptic number.

It is an amenable number.

281989072 is a deficient number, since it is larger than the sum of its proper divisors (271851348).

281989072 is a wasteful number, since it uses less digits than its factorization.

281989072 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 241510 (or 241504 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 46.

The square root of 281989072 is about 16792.5302441294. The cubic root of 281989072 is about 655.7587477934.

The spelling of 281989072 in words is "two hundred eighty-one million, nine hundred eighty-nine thousand, seventy-two".