28613312 has 112 divisors (see below), whose sum is σ = 74249280. Its totient is φ = 10653696.

The previous prime is 28613267. The next prime is 28613317. The reversal of 28613312 is 21331682.

It is a tau number, because it is divible by the number of its divisors (112).

It is a Harshad number since it is a multiple of its sum of digits (26).

It is not an unprimeable number, because it can be changed into a prime (28613317) 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 15 ways as a sum of consecutive naturals, for example, 1683128 + ... + 1683144.

It is an arithmetic number, because the mean of its divisors is an integer number (662940).

Almost surely, 2^28613312 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 28613312, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (37124640).

28613312 is an abundant number, since it is smaller than the sum of its proper divisors (45635968).

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

28613312 is an equidigital number, since it uses as much as digits as its factorization.

28613312 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 83 (or 39 counting only the distinct ones).

The product of its digits is 1728, while the sum is 26.

The square root of 28613312 is about 5349.1412394888. The cubic root of 28613312 is about 305.8600182787.

Adding to 28613312 its reverse (21331682), we get a palindrome (49944994).

It can be divided in two parts, 28 and 613312, that multiplied together give a square (17172736 = 4144²).

The spelling of 28613312 in words is "twenty-eight million, six hundred thirteen thousand, three hundred twelve".