28093320 has 96 divisors (see below), whose sum is σ = 92640600. Its totient is φ = 7382016.

The previous prime is 28093309. The next prime is 28093321. The reversal of 28093320 is 2339082.

It can be written as a sum of positive squares in 4 ways, for example, as 22867524 + 5225796 = 4782^2 + 2286^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28093321) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 25746 + ... + 26814.

Almost surely, 2^28093320 is an apocalyptic number.

28093320 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 28093320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (46320300).

28093320 is an abundant number, since it is smaller than the sum of its proper divisors (64547280).

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

28093320 is a wasteful number, since it uses less digits than its factorization.

28093320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1159 (or 1152 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 27.

The square root of 28093320 is about 5300.3131982931. The cubic root of 28093320 is about 303.9958736744.

The spelling of 28093320 in words is "twenty-eight million, ninety-three thousand, three hundred twenty".