28343520 has 144 divisors (see below), whose sum is σ = 100442160. Its totient is φ = 7558272.

The previous prime is 28343507. The next prime is 28343537. The reversal of 28343520 is 2534382.

It is a tau number, because it is divible by the number of its divisors (144).

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 5668702 + ... + 5668706.

It is an arithmetic number, because the mean of its divisors is an integer number (697515).

Almost surely, 2^28343520 is an apocalyptic number.

28343520 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 28343520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50221080).

28343520 is an abundant number, since it is smaller than the sum of its proper divisors (72098640).

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

28343520 is an frugal number, since it uses more digits than its factorization.

28343520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48 (or 10 counting only the distinct ones).

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

The square root of 28343520 is about 5323.8632589502. The cubic root of 28343520 is about 304.8956733575.

The spelling of 28343520 in words is "twenty-eight million, three hundred forty-three thousand, five hundred twenty".