281728856 has 8 divisors (see below), whose sum is σ = 528241620. Its totient is φ = 140864424.

The previous prime is 281728849. The next prime is 281728871. The reversal of 281728856 is 658827182.

It is a tau number, because it is divible by the number of its divisors (8).

It is a super-2 number, since 2×281728856² = 158742296606137472, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 281728856.

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, 17608046 + ... + 17608061.

Almost surely, 2^281728856 is an apocalyptic number.

It is an amenable number.

281728856 is a deficient number, since it is larger than the sum of its proper divisors (246512764).

281728856 is a wasteful number, since it uses less digits than its factorization.

281728856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35216113 (or 35216109 counting only the distinct ones).

The product of its digits is 430080, while the sum is 47.

The square root of 281728856 is about 16784.7804870960. The cubic root of 281728856 is about 655.5569770512.

The spelling of 281728856 in words is "two hundred eighty-one million, seven hundred twenty-eight thousand, eight hundred fifty-six".