28385247 has 16 divisors (see below), whose sum is σ = 41856768. Its totient is φ = 16966080.

The previous prime is 28385239. The next prime is 28385249. The reversal of 28385247 is 74258382.

It is not a de Polignac number, because 28385247 - 2³ = 28385239 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28385249) 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 15 ways as a sum of consecutive naturals, for example, 3483 + ... + 8300.

It is an arithmetic number, because the mean of its divisors is an integer number (2616048).

Almost surely, 2^28385247 is an apocalyptic number.

28385247 is a deficient number, since it is larger than the sum of its proper divisors (13471521).

28385247 is a wasteful number, since it uses less digits than its factorization.

28385247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11870.

The product of its digits is 107520, while the sum is 39.

The square root of 28385247 is about 5327.7806824230. The cubic root of 28385247 is about 305.0452212802.

The spelling of 28385247 in words is "twenty-eight million, three hundred eighty-five thousand, two hundred forty-seven".