28071712 has 48 divisors (see below), whose sum is σ = 57230712. Its totient is φ = 13547520.

The previous prime is 28071691. The next prime is 28071713. The reversal of 28071712 is 21717082.

It can be written as a sum of positive squares in 4 ways, for example, as 24960016 + 3111696 = 4996^2 + 1764^2 .

It is a super-2 number, since 2×28071712² = 1576042029221888, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (28071713) 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 in 7 ways as a sum of consecutive naturals, for example, 142398 + ... + 142594.

Almost surely, 2^28071712 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28071712, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28615356).

28071712 is an abundant number, since it is smaller than the sum of its proper divisors (29159000).

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

28071712 is a wasteful number, since it uses less digits than its factorization.

28071712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 341 (or 333 counting only the distinct ones).

The product of its (nonzero) digits is 1568, while the sum is 28.

The square root of 28071712 is about 5298.2744360782. The cubic root of 28071712 is about 303.9179141253.

Adding to 28071712 its reverse (21717082), we get a palindrome (49788794).

The spelling of 28071712 in words is "twenty-eight million, seventy-one thousand, seven hundred twelve".