28634911 has 4 divisors (see below), whose sum is σ = 28785024. Its totient is φ = 28484800.

The previous prime is 28634909. The next prime is 28634923. The reversal of 28634911 is 11943682.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11943682 = 2 ⋅5971841.

It is a cyclic number.

It is not a de Polignac number, because 28634911 - 2¹ = 28634909 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28634951) 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 3 ways as a sum of consecutive naturals, for example, 74770 + ... + 75151.

It is an arithmetic number, because the mean of its divisors is an integer number (7196256).

Almost surely, 2^28634911 is an apocalyptic number.

28634911 is a deficient number, since it is larger than the sum of its proper divisors (150113).

28634911 is a wasteful number, since it uses less digits than its factorization.

28634911 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 150112.

The product of its digits is 10368, while the sum is 34.

The square root of 28634911 is about 5351.1597808326. The cubic root of 28634911 is about 305.9369592607.

The spelling of 28634911 in words is "twenty-eight million, six hundred thirty-four thousand, nine hundred eleven".