28097280 has 180 divisors, whose sum is σ = 100908192. Its totient is φ = 7464960.

The previous prime is 28097233. The next prime is 28097287. The reversal of 28097280 is 8279082.

It is a tau number, because it is divible by the number of its divisors (180).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is not an unprimeable number, because it can be changed into a prime (28097287) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 103545 + ... + 103815.

Almost surely, 2^28097280 is an apocalyptic number.

28097280 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 28097280, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (50454096).

28097280 is an abundant number, since it is smaller than the sum of its proper divisors (72810912).

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

28097280 is an equidigital number, since it uses as much as digits as its factorization.

28097280 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 304 (or 281 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 28097280 is about 5300.6867479601. The cubic root of 28097280 is about 304.0101566320.

The spelling of 28097280 in words is "twenty-eight million, ninety-seven thousand, two hundred eighty".