281145028 has 12 divisors (see below), whose sum is σ = 493781932. Its totient is φ = 140064480.

The previous prime is 281145013. The next prime is 281145043. The reversal of 281145028 is 820541182.

It is an interprime number because it is at equal distance from previous prime (281145013) and next prime (281145043).

It can be written as a sum of positive squares in 2 ways, for example, as 57881664 + 223263364 = 7608^2 + 14942^2 .

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 3 ways as a sum of consecutive naturals, for example, 125763 + ... + 127978.

Almost surely, 2^281145028 is an apocalyptic number.

It is an amenable number.

281145028 is a deficient number, since it is larger than the sum of its proper divisors (212636904).

281145028 is a wasteful number, since it uses less digits than its factorization.

281145028 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 254022 (or 254020 counting only the distinct ones).

The product of its (nonzero) digits is 5120, while the sum is 31.

The square root of 281145028 is about 16767.3798788004. The cubic root of 281145028 is about 655.1038259748.

The spelling of 281145028 in words is "two hundred eighty-one million, one hundred forty-five thousand, twenty-eight".