281116728 has 48 divisors (see below), whose sum is σ = 762281520. Its totient is φ = 93591936.

The previous prime is 281116727. The next prime is 281116747. The reversal of 281116728 is 827611182.

It is a super-2 number, since 2×281116728² = 158053229522851968, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a junction number, because it is equal to n+sod(n) for n = 281116692 and 281116701.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (281116727) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 74700 + ... + 78372.

It is an arithmetic number, because the mean of its divisors is an integer number (15880865).

Almost surely, 2^281116728 is an apocalyptic number.

It is an amenable number.

281116728 is an abundant number, since it is smaller than the sum of its proper divisors (481164792).

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

281116728 is a wasteful number, since it uses less digits than its factorization.

281116728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4748 (or 4741 counting only the distinct ones).

The product of its digits is 10752, while the sum is 36.

The square root of 281116728 is about 16766.5359570783. The cubic root of 281116728 is about 655.0818443656.

The spelling of 281116728 in words is "two hundred eighty-one million, one hundred sixteen thousand, seven hundred twenty-eight".