28513296 has 150 divisors (see below), whose sum is σ = 96213150. Its totient is φ = 8128512.

The previous prime is 28513283. The next prime is 28513297. The reversal of 28513296 is 69231582.

It can be written as a sum of positive squares in only one way, i.e., 25401600 + 3111696 = 5040^2 + 1764^2 .

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 28513296.

It is not an unprimeable number, because it can be changed into a prime (28513297) by changing a digit.

It is a polite number, since it can be written in 29 ways as a sum of consecutive naturals, for example, 63280 + ... + 63728.

It is an arithmetic number, because the mean of its divisors is an integer number (641421).

Almost surely, 2^28513296 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 28513296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (48106575).

28513296 is an abundant number, since it is smaller than the sum of its proper divisors (67699854).

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

28513296 is a wasteful number, since it uses less digits than its factorization.

28513296 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 483 (or 461 counting only the distinct ones).

The product of its digits is 25920, while the sum is 36.

The square root of 28513296 is about 5339.7842653051. The cubic root of 28513296 is about 305.5032308761.

The spelling of 28513296 in words is "twenty-eight million, five hundred thirteen thousand, two hundred ninety-six".