281438128 has 40 divisors (see below), whose sum is σ = 583368912. Its totient is φ = 131063808.

The previous prime is 281438117. The next prime is 281438149. The reversal of 281438128 is 821834182.

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 7 ways as a sum of consecutive naturals, for example, 21051 + ... + 31717.

Almost surely, 2^281438128 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 281438128, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (291684456).

281438128 is an abundant number, since it is smaller than the sum of its proper divisors (301930784).

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

281438128 is a wasteful number, since it uses less digits than its factorization.

281438128 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10789 (or 10783 counting only the distinct ones).

The product of its digits is 24576, while the sum is 37.

The square root of 281438128 is about 16776.1177869017. The cubic root of 281438128 is about 655.3314003885.

The spelling of 281438128 in words is "two hundred eighty-one million, four hundred thirty-eight thousand, one hundred twenty-eight".