28134720 has 84 divisors (see below), whose sum is σ = 96781620. Its totient is φ = 7501824.

The previous prime is 28134719. The next prime is 28134721. The reversal of 28134720 is 2743182.

It is an interprime number because it is at equal distance from previous prime (28134719) and next prime (28134721).

It can be written as a sum of positive squares in 2 ways, for example, as 9884736 + 18249984 = 3144^2 + 4272^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28134721) 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 11 ways as a sum of consecutive naturals, for example, 2005 + ... + 7764.

Almost surely, 2^28134720 is an apocalyptic number.

28134720 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 28134720, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48390810).

28134720 is an abundant number, since it is smaller than the sum of its proper divisors (68646900).

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

28134720 is a wasteful number, since it uses less digits than its factorization.

28134720 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9792 (or 9779 counting only the distinct ones).

The product of its (nonzero) digits is 2688, while the sum is 27.

The square root of 28134720 is about 5304.2171901233. The cubic root of 28134720 is about 304.1451292271.

The spelling of 28134720 in words is "twenty-eight million, one hundred thirty-four thousand, seven hundred twenty".