136644005 has 4 divisors (see below), whose sum is σ = 163972812. Its totient is φ = 109315200.

The previous prime is 136643987. The next prime is 136644031. The reversal of 136644005 is 500446631.

It is a happy number.

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 73170916 + 63473089 = 8554^2 + 7967^2 .

It is not a de Polignac number, because 136644005 - 2¹⁰ = 136642981 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 13664396 + ... + 13664405.

It is an arithmetic number, because the mean of its divisors is an integer number (40993203).

Almost surely, 2^136644005 is an apocalyptic number.

It is an amenable number.

136644005 is a deficient number, since it is larger than the sum of its proper divisors (27328807).

136644005 is an equidigital number, since it uses as much as digits as its factorization.

136644005 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27328806.

The product of its (nonzero) digits is 8640, while the sum is 29.

The square root of 136644005 is about 11689.4826660550. The cubic root of 136644005 is about 515.0667648384.

The spelling of 136644005 in words is "one hundred thirty-six million, six hundred forty-four thousand, five".