28997120 has 80 divisors (see below), whose sum is σ = 71299008. Its totient is φ = 11304960.

The previous prime is 28997119. The next prime is 28997123. The reversal of 28997120 is 2179982.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28997123) 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 7 ways as a sum of consecutive naturals, for example, 120200 + ... + 120440.

Almost surely, 2^28997120 is an apocalyptic number.

28997120 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 28997120, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (35649504).

28997120 is an abundant number, since it is smaller than the sum of its proper divisors (42301888).

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

28997120 is an equidigital number, since it uses as much as digits as its factorization.

28997120 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 311 (or 295 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 38.

The square root of 28997120 is about 5384.8973992083. The cubic root of 28997120 is about 307.2215118038.

The spelling of 28997120 in words is "twenty-eight million, nine hundred ninety-seven thousand, one hundred twenty".