136644 has 24 divisors (see below), whose sum is σ = 325920. Its totient is φ = 44544.

The previous prime is 136621. The next prime is 136649. The reversal of 136644 is 446631.

136644 = T₂₂ + T₂₃ + ... + T₉₃.

It is a nude number because it is divisible by every one of its digits.

It is not an unprimeable number, because it can be changed into a prime (136649) by changing a digit.

136644 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 612 + ... + 804.

It is an arithmetic number, because the mean of its divisors is an integer number (13580).

2¹³⁶⁶⁴⁴ is an apocalyptic number.

It is an amenable number.

136644 is an abundant number, since it is smaller than the sum of its proper divisors (189276).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

136644 is a wasteful number, since it uses less digits than its factorization.

136644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 259 (or 257 counting only the distinct ones).

The product of its digits is 1728, while the sum is 24.

The square root of 136644 is about 369.6538921748. The cubic root of 136644 is about 51.5066758556.

It can be divided in two parts, 136 and 644, that added together give a triangular number (780 = T₃₉).

The spelling of 136644 in words is "one hundred thirty-six thousand, six hundred forty-four".