28543320 has 256 divisors, whose sum is σ = 108864000. Its totient is φ = 6594048.

The previous prime is 28543259. The next prime is 28543327. The reversal of 28543320 is 2334582.

It is a super-2 number, since 2×28543320² = 1629442233244800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28543327) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 266707 + ... + 266813.

It is an arithmetic number, because the mean of its divisors is an integer number (425250).

Almost surely, 2^28543320 is an apocalyptic number.

28543320 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 28543320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (54432000).

28543320 is an abundant number, since it is smaller than the sum of its proper divisors (80320680).

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

28543320 is a wasteful number, since it uses less digits than its factorization.

28543320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 159 (or 149 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 28543320 is about 5342.5948751520. The cubic root of 28543320 is about 305.6104231069.

The spelling of 28543320 in words is "twenty-eight million, five hundred forty-three thousand, three hundred twenty".