28281130 has 8 divisors (see below), whose sum is σ = 50906052. Its totient is φ = 11312448.

The previous prime is 28281091. The next prime is 28281151. The reversal of 28281130 is 3118282.

It can be written as a sum of positive squares in 2 ways, for example, as 24810361 + 3470769 = 4981^2 + 1863^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a junction number, because it is equal to n+sod(n) for n = 28281095 and 28281104.

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 3 ways as a sum of consecutive naturals, for example, 1414047 + ... + 1414066.

Almost surely, 2^28281130 is an apocalyptic number.

28281130 is a deficient number, since it is larger than the sum of its proper divisors (22624922).

28281130 is a wasteful number, since it uses less digits than its factorization.

28281130 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2828120.

The product of its (nonzero) digits is 768, while the sum is 25.

The square root of 28281130 is about 5318.0005641218. Note that the first 3 decimals coincide. The cubic root of 28281130 is about 304.6717960173.

The spelling of 28281130 in words is "twenty-eight million, two hundred eighty-one thousand, one hundred thirty".