281128040 has 16 divisors (see below), whose sum is σ = 632538180. Its totient is φ = 112451200.

The previous prime is 281128027. The next prime is 281128051. The reversal of 281128040 is 40821182.

It can be written as a sum of positive squares in 2 ways, for example, as 254274916 + 26853124 = 15946^2 + 5182^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3514061 + ... + 3514140.

Almost surely, 2^281128040 is an apocalyptic number.

281128040 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

281128040 is an abundant number, since it is smaller than the sum of its proper divisors (351410140).

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

281128040 is a wasteful number, since it uses less digits than its factorization.

281128040 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7028212 (or 7028208 counting only the distinct ones).

The product of its (nonzero) digits is 1024, while the sum is 26.

The square root of 281128040 is about 16766.8732922987. The cubic root of 281128040 is about 655.0906309724.

The spelling of 281128040 in words is "two hundred eighty-one million, one hundred twenty-eight thousand, forty".