281648128 has 22 divisors (see below), whose sum is σ = 563023256. Its totient is φ = 140823552.

The previous prime is 281648119. The next prime is 281648141. The reversal of 281648128 is 821846182.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 136500 + ... + 138547.

Almost surely, 2^281648128 is an apocalyptic number.

It is an amenable number.

281648128 is a deficient number, since it is larger than the sum of its proper divisors (281375128).

281648128 is an equidigital number, since it uses as much as digits as its factorization.

281648128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 275067 (or 275049 counting only the distinct ones).

The product of its digits is 49152, while the sum is 40.

The square root of 281648128 is about 16782.3755171906. The cubic root of 281648128 is about 655.4943555410.

The spelling of 281648128 in words is "two hundred eighty-one million, six hundred forty-eight thousand, one hundred twenty-eight".