28322320 has 80 divisors (see below), whose sum is σ = 71839152. Its totient is φ = 10321920.

The previous prime is 28322317. The next prime is 28322347. The reversal of 28322320 is 2322382.

It can be written as a sum of positive squares in 8 ways, for example, as 5588496 + 22733824 = 2364^2 + 4768^2 .

It is a tau number, because it is divible by the number of its divisors (80).

It is a junction number, because it is equal to n+sod(n) for n = 28322291 and 28322300.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 117400 + ... + 117640.

Almost surely, 2^28322320 is an apocalyptic number.

28322320 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 28322320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35919576).

28322320 is an abundant number, since it is smaller than the sum of its proper divisors (43516832).

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

28322320 is a wasteful number, since it uses less digits than its factorization.

28322320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 380 (or 374 counting only the distinct ones).

The product of its (nonzero) digits is 1152, while the sum is 22.

The square root of 28322320 is about 5321.8718511441. The cubic root of 28322320 is about 304.8196371593.

The spelling of 28322320 in words is "twenty-eight million, three hundred twenty-two thousand, three hundred twenty".