28135766 has 4 divisors (see below), whose sum is σ = 42203652. Its totient is φ = 14067882.

The previous prime is 28135759. The next prime is 28135769. The reversal of 28135766 is 66753182.

It is a semiprime because it is the product of two primes.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (28135769) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 7033940 + ... + 7033943.

It is an arithmetic number, because the mean of its divisors is an integer number (10550913).

Almost surely, 2^28135766 is an apocalyptic number.

28135766 is a deficient number, since it is larger than the sum of its proper divisors (14067886).

28135766 is a wasteful number, since it uses less digits than its factorization.

28135766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14067885.

The product of its digits is 60480, while the sum is 38.

The square root of 28135766 is about 5304.3157899959. The cubic root of 28135766 is about 304.1488983762.

The spelling of 28135766 in words is "twenty-eight million, one hundred thirty-five thousand, seven hundred sixty-six".