28636647 has 8 divisors (see below), whose sum is σ = 41119344. Its totient is φ = 17622528.

The previous prime is 28636639. The next prime is 28636649. The reversal of 28636647 is 74663682.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 28636647 - 2³ = 28636639 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 28636599 and 28636608.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28636649) 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 7 ways as a sum of consecutive naturals, for example, 367098 + ... + 367175.

It is an arithmetic number, because the mean of its divisors is an integer number (5139918).

Almost surely, 2^28636647 is an apocalyptic number.

28636647 is a deficient number, since it is larger than the sum of its proper divisors (12482697).

28636647 is a wasteful number, since it uses less digits than its factorization.

28636647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734289.

The product of its digits is 290304, while the sum is 42.

The square root of 28636647 is about 5351.3219862012. The cubic root of 28636647 is about 305.9431416421.

The spelling of 28636647 in words is "twenty-eight million, six hundred thirty-six thousand, six hundred forty-seven".