136644434 has 4 divisors (see below), whose sum is σ = 204966654. Its totient is φ = 68322216.

The previous prime is 136644427. The next prime is 136644437. The reversal of 136644434 is 434446631.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 434446631 = 353 ⋅1230727.

It can be written as a sum of positive squares in only one way, i.e., 134676025 + 1968409 = 11605^2 + 1403^2 .

It is a junction number, because it is equal to n+sod(n) for n = 136644394 and 136644403.

It is not an unprimeable number, because it can be changed into a prime (136644437) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 34161107 + ... + 34161110.

Almost surely, 2^136644434 is an apocalyptic number.

136644434 is a deficient number, since it is larger than the sum of its proper divisors (68322220).

136644434 is an equidigital number, since it uses as much as digits as its factorization.

136644434 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68322219.

The product of its digits is 82944, while the sum is 35.

The square root of 136644434 is about 11689.5010158689. The cubic root of 136644434 is about 515.0673038629.

The spelling of 136644434 in words is "one hundred thirty-six million, six hundred forty-four thousand, four hundred thirty-four".