135721766 has 16 divisors (see below), whose sum is σ = 209127744. Its totient is φ = 66037224.

The previous prime is 135721757. The next prime is 135721823. The reversal of 135721766 is 667127531.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 5021 + ... + 17223.

It is an arithmetic number, because the mean of its divisors is an integer number (13070484).

Almost surely, 2^135721766 is an apocalyptic number.

135721766 is a deficient number, since it is larger than the sum of its proper divisors (73405978).

135721766 is a wasteful number, since it uses less digits than its factorization.

135721766 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12355.

The product of its digits is 52920, while the sum is 38.

The square root of 135721766 is about 11649.9684978115. The cubic root of 135721766 is about 513.9053836249.

The spelling of 135721766 in words is "one hundred thirty-five million, seven hundred twenty-one thousand, seven hundred sixty-six".