28281872 has 10 divisors (see below), whose sum is σ = 54796158. Its totient is φ = 14140928.

The previous prime is 28281871. The next prime is 28281887. The reversal of 28281872 is 27818282.

It can be written as a sum of positive squares in only one way, i.e., 28047616 + 234256 = 5296^2 + 484^2 .

It is not an unprimeable number, because it can be changed into a prime (28281871) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 883793 + ... + 883824.

Almost surely, 2^28281872 is an apocalyptic number.

It is an amenable number.

28281872 is a deficient number, since it is larger than the sum of its proper divisors (26514286).

28281872 is a wasteful number, since it uses less digits than its factorization.

28281872 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1767625 (or 1767619 counting only the distinct ones).

The product of its digits is 28672, while the sum is 38.

The square root of 28281872 is about 5318.0703267257. The cubic root of 28281872 is about 304.6744605088.

The spelling of 28281872 in words is "twenty-eight million, two hundred eighty-one thousand, eight hundred seventy-two".