281268045 has 80 divisors (see below), whose sum is σ = 522720000. Its totient is φ = 144623232.

The previous prime is 281268041. The next prime is 281268067. The reversal of 281268045 is 540862182.

It is not a de Polignac number, because 281268045 - 2² = 281268041 is a prime.

It is a super-2 number, since 2×281268045² = 158223426276244050, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281268041) by changing a digit.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1887631 + ... + 1887779.

It is an arithmetic number, because the mean of its divisors is an integer number (6534000).

Almost surely, 2^281268045 is an apocalyptic number.

It is an amenable number.

281268045 is a deficient number, since it is larger than the sum of its proper divisors (241451955).

281268045 is a wasteful number, since it uses less digits than its factorization.

281268045 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 30720, while the sum is 36.

The square root of 281268045 is about 16771.0478205746. The cubic root of 281268045 is about 655.1993604832.

The spelling of 281268045 in words is "two hundred eighty-one million, two hundred sixty-eight thousand, forty-five".