28766647 has 16 divisors (see below), whose sum is σ = 35546112. Its totient is φ = 22669920.

The previous prime is 28766623. The next prime is 28766671. The reversal of 28766647 is 74666782.

It is an interprime number because it is at equal distance from previous prime (28766623) and next prime (28766671).

It is not a de Polignac number, because 28766647 - 2⁷ = 28766519 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28766597 and 28766606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28761647) 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, 31122 + ... + 32032.

It is an arithmetic number, because the mean of its divisors is an integer number (2221632).

Almost surely, 2^28766647 is an apocalyptic number.

28766647 is a deficient number, since it is larger than the sum of its proper divisors (6779465).

28766647 is a wasteful number, since it uses less digits than its factorization.

28766647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1278.

The product of its digits is 677376, while the sum is 46.

The square root of 28766647 is about 5363.4547634897. The cubic root of 28766647 is about 306.4053998496.

The spelling of 28766647 in words is "twenty-eight million, seven hundred sixty-six thousand, six hundred forty-seven".