28200320 has 64 divisors (see below), whose sum is σ = 68115600. Its totient is φ = 11163648.

The previous prime is 28200287. The next prime is 28200349. The reversal of 28200320 is 2300282.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 88802 + ... + 89118.

Almost surely, 2^28200320 is an apocalyptic number.

28200320 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 28200320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (34057800).

28200320 is an abundant number, since it is smaller than the sum of its proper divisors (39915280).

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

28200320 is a wasteful number, since it uses less digits than its factorization.

28200320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 475 (or 463 counting only the distinct ones).

The product of its (nonzero) digits is 192, while the sum is 17.

The square root of 28200320 is about 5310.3973485983. The cubic root of 28200320 is about 304.3813312537.

The spelling of 28200320 in words is "twenty-eight million, two hundred thousand, three hundred twenty".