28806320 has 40 divisors (see below), whose sum is σ = 67217424. Its totient is φ = 11480832.

The previous prime is 28806293. The next prime is 28806361. The reversal of 28806320 is 2360882.

It is a tau number, because it is divible by the number of its divisors (40).

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, 31307 + ... + 32213.

Almost surely, 2^28806320 is an apocalyptic number.

28806320 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

28806320 is an abundant number, since it is smaller than the sum of its proper divisors (38411104).

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

28806320 is a wasteful number, since it uses less digits than its factorization.

28806320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1317 (or 1311 counting only the distinct ones).

The product of its (nonzero) digits is 4608, while the sum is 29.

The square root of 28806320 is about 5367.1519449332. The cubic root of 28806320 is about 306.5461929639.

The spelling of 28806320 in words is "twenty-eight million, eight hundred six thousand, three hundred twenty".