28297320 has 32 divisors (see below), whose sum is σ = 84892320. Its totient is φ = 7545920.

The previous prime is 28297319. The next prime is 28297331. The reversal of 28297320 is 2379282.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 117786 + ... + 118025.

It is an arithmetic number, because the mean of its divisors is an integer number (2652885).

Almost surely, 2^28297320 is an apocalyptic number.

28297320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28297320 is an abundant number, since it is smaller than the sum of its proper divisors (56595000).

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

28297320 is a wasteful number, since it uses less digits than its factorization.

28297320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 235825 (or 235821 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 33.

The square root of 28297320 is about 5319.5225349650. The cubic root of 28297320 is about 304.7299230607.

The spelling of 28297320 in words is "twenty-eight million, two hundred ninety-seven thousand, three hundred twenty".