136687809 has 8 divisors (see below), whose sum is σ = 186695712. Its totient is φ = 88902560.

The previous prime is 136687799. The next prime is 136687829. The reversal of 136687809 is 908786631.

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

It is a cyclic number.

It is not a de Polignac number, because 136687809 - 2⁸ = 136687553 is a prime.

It is not an unprimeable number, because it can be changed into a prime (136687829) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 555519 + ... + 555764.

It is an arithmetic number, because the mean of its divisors is an integer number (23336964).

Almost surely, 2^136687809 is an apocalyptic number.

It is an amenable number.

136687809 is a deficient number, since it is larger than the sum of its proper divisors (50007903).

136687809 is a wasteful number, since it uses less digits than its factorization.

136687809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1111327.

The product of its (nonzero) digits is 435456, while the sum is 48.

The square root of 136687809 is about 11691.3561659886. The cubic root of 136687809 is about 515.1217973152.

The spelling of 136687809 in words is "one hundred thirty-six million, six hundred eighty-seven thousand, eight hundred nine".