281380868 has 12 divisors (see below), whose sum is σ = 504426972. Its totient is φ = 137258880.

The previous prime is 281380837. The next prime is 281380871. The reversal of 281380868 is 868083182.

It can be written as a sum of positive squares in 2 ways, for example, as 115949824 + 165431044 = 10768^2 + 12862^2 .

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, 857705 + ... + 858032.

It is an arithmetic number, because the mean of its divisors is an integer number (42035581).

Almost surely, 2^281380868 is an apocalyptic number.

It is an amenable number.

281380868 is a deficient number, since it is larger than the sum of its proper divisors (223046104).

281380868 is a wasteful number, since it uses less digits than its factorization.

281380868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1715782 (or 1715780 counting only the distinct ones).

The product of its (nonzero) digits is 147456, while the sum is 44.

The square root of 281380868 is about 16774.4111073981. The cubic root of 281380868 is about 655.2869538864.

The spelling of 281380868 in words is "two hundred eighty-one million, three hundred eighty thousand, eight hundred sixty-eight".