28397320 has 32 divisors (see below), whose sum is σ = 73022400. Its totient is φ = 9736128.

The previous prime is 28397311. The next prime is 28397323. The reversal of 28397320 is 2379382.

It is a Smith number, since the sum of its digits (34) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (28397323) 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, 50430 + ... + 50989.

It is an arithmetic number, because the mean of its divisors is an integer number (2281950).

Almost surely, 2^28397320 is an apocalyptic number.

28397320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28397320 is an abundant number, since it is smaller than the sum of its proper divisors (44625080).

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

28397320 is a wasteful number, since it uses less digits than its factorization.

28397320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 101437 (or 101433 counting only the distinct ones).

The product of its (nonzero) digits is 18144, while the sum is 34.

The square root of 28397320 is about 5328.9135853380. The cubic root of 28397320 is about 305.0884630969.

The spelling of 28397320 in words is "twenty-eight million, three hundred ninety-seven thousand, three hundred twenty".