28328307 has 32 divisors (see below), whose sum is σ = 46374912. Its totient is φ = 15012864.

The previous prime is 28328299. The next prime is 28328323. The reversal of 28328307 is 70382382.

It is a happy number.

It is not a de Polignac number, because 28328307 - 2³ = 28328299 is a prime.

It is not an unprimeable number, because it can be changed into a prime (28328207) 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 31 ways as a sum of consecutive naturals, for example, 25518 + ... + 26604.

It is an arithmetic number, because the mean of its divisors is an integer number (1449216).

Almost surely, 2^28328307 is an apocalyptic number.

28328307 is a deficient number, since it is larger than the sum of its proper divisors (18046605).

28328307 is a wasteful number, since it uses less digits than its factorization.

28328307 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1187.

The product of its (nonzero) digits is 16128, while the sum is 33.

The square root of 28328307 is about 5322.4343114782. The cubic root of 28328307 is about 304.8411140556.

The spelling of 28328307 in words is "twenty-eight million, three hundred twenty-eight thousand, three hundred seven".