135687785 has 4 divisors (see below), whose sum is σ = 162825348. Its totient is φ = 108550224.

The previous prime is 135687763. The next prime is 135687809. The reversal of 135687785 is 587786531.

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

It can be written as a sum of positive squares in 2 ways, for example, as 50069776 + 85618009 = 7076^2 + 9253^2 .

It is a cyclic number.

It is not a de Polignac number, because 135687785 - 2¹⁴ = 135671401 is a prime.

It is a super-2 number, since 2×135687785² = 36822349996412450, which contains 22 as substring.

It is a Duffinian 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 3 ways as a sum of consecutive naturals, for example, 13568774 + ... + 13568783.

It is an arithmetic number, because the mean of its divisors is an integer number (40706337).

Almost surely, 2^135687785 is an apocalyptic number.

It is an amenable number.

135687785 is a deficient number, since it is larger than the sum of its proper divisors (27137563).

135687785 is an equidigital number, since it uses as much as digits as its factorization.

135687785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27137562.

The product of its digits is 1411200, while the sum is 50.

The square root of 135687785 is about 11648.5099905524. The cubic root of 135687785 is about 513.8624907837.

The spelling of 135687785 in words is "one hundred thirty-five million, six hundred eighty-seven thousand, seven hundred eighty-five".