28531296 has 72 divisors (see below), whose sum is σ = 81782064. Its totient is φ = 9434880.

The previous prime is 28531291. The next prime is 28531297. The reversal of 28531296 is 69213582.

It is a tau number, because it is divible by the number of its divisors (72).

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 28531296.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28531291) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 44901 + ... + 45531.

It is an arithmetic number, because the mean of its divisors is an integer number (1135862).

Almost surely, 2^28531296 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 28531296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40891032).

28531296 is an abundant number, since it is smaller than the sum of its proper divisors (53250768).

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

28531296 is a wasteful number, since it uses less digits than its factorization.

28531296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 804 (or 793 counting only the distinct ones).

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

The square root of 28531296 is about 5341.4694607383. The cubic root of 28531296 is about 305.5675038315.

The spelling of 28531296 in words is "twenty-eight million, five hundred thirty-one thousand, two hundred ninety-six".