28308807 has 12 divisors (see below), whose sum is σ = 41052960. Its totient is φ = 18797568.

The previous prime is 28308793. The next prime is 28308821. The reversal of 28308807 is 70880382.

It is an interprime number because it is at equal distance from previous prime (28308793) and next prime (28308821).

It is not a de Polignac number, because 28308807 - 2⁸ = 28308551 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28308857) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3807 + ... + 8432.

It is an arithmetic number, because the mean of its divisors is an integer number (3421080).

Almost surely, 2^28308807 is an apocalyptic number.

28308807 is a deficient number, since it is larger than the sum of its proper divisors (12744153).

28308807 is a wasteful number, since it uses less digits than its factorization.

28308807 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12502 (or 12499 counting only the distinct ones).

The product of its (nonzero) digits is 21504, while the sum is 36.

The square root of 28308807 is about 5320.6021275792. The cubic root of 28308807 is about 304.7711514536.

The spelling of 28308807 in words is "twenty-eight million, three hundred eight thousand, eight hundred seven".