28203520 has 80 divisors (see below), whose sum is σ = 70709760. Its totient is φ = 10768384.

The previous prime is 28203503. The next prime is 28203523. The reversal of 28203520 is 2530282.

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 = 28203491 and 28203500.

It is not an unprimeable number, because it can be changed into a prime (28203523) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 58641 + ... + 59119.

It is an arithmetic number, because the mean of its divisors is an integer number (883872).

Almost surely, 2^28203520 is an apocalyptic number.

28203520 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 28203520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35354880).

28203520 is an abundant number, since it is smaller than the sum of its proper divisors (42506240).

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

28203520 is an equidigital number, since it uses as much as digits as its factorization.

28203520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 525 (or 509 counting only the distinct ones).

The product of its (nonzero) digits is 960, while the sum is 22.

The square root of 28203520 is about 5310.6986357729. The cubic root of 28203520 is about 304.3928439294.

The spelling of 28203520 in words is "twenty-eight million, two hundred three thousand, five hundred twenty".