28171296 has 72 divisors (see below), whose sum is σ = 82899180. Its totient is φ = 9063936.

The previous prime is 28171291. The next prime is 28171301. The reversal of 28171296 is 69217182.

It is an interprime number because it is at equal distance from previous prime (28171291) and next prime (28171301).

It can be written as a sum of positive squares in 2 ways, for example, as 24800400 + 3370896 = 4980^2 + 1836^2 .

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 28171296.

It is not an unprimeable number, because it can be changed into a prime (28171291) 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, 6666 + ... + 10038.

Almost surely, 2^28171296 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 28171296, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (41449590).

28171296 is an abundant number, since it is smaller than the sum of its proper divisors (54727884).

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

28171296 is a wasteful number, since it uses less digits than its factorization.

28171296 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3418 (or 3407 counting only the distinct ones).

The product of its digits is 12096, while the sum is 36.

The square root of 28171296 is about 5307.6638929005. The cubic root of 28171296 is about 304.2768714899.

The spelling of 28171296 in words is "twenty-eight million, one hundred seventy-one thousand, two hundred ninety-six".