281561448 has 48 divisors (see below), whose sum is σ = 818830080. Its totient is φ = 80445792.

The previous prime is 281561431. The next prime is 281561459. The reversal of 281561448 is 844165182.

281561448 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 118536 + ... + 120887.

It is an arithmetic number, because the mean of its divisors is an integer number (17058960).

Almost surely, 2^281561448 is an apocalyptic number.

281561448 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

281561448 is an abundant number, since it is smaller than the sum of its proper divisors (537268632).

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

281561448 is a wasteful number, since it uses less digits than its factorization.

281561448 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 239446 (or 239435 counting only the distinct ones).

The product of its digits is 61440, while the sum is 39.

The square root of 281561448 is about 16779.7928473506. The cubic root of 281561448 is about 655.4271036821.

The spelling of 281561448 in words is "two hundred eighty-one million, five hundred sixty-one thousand, four hundred forty-eight".