136981644 has 12 divisors (see below), whose sum is σ = 319623864. Its totient is φ = 45660544.

The previous prime is 136981643. The next prime is 136981679. The reversal of 136981644 is 446189631.

It is a tau number, because it is divible by the number of its divisors (12).

It is a junction number, because it is equal to n+sod(n) for n = 136981596 and 136981605.

It is not an unprimeable number, because it can be changed into a prime (136981643) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5707557 + ... + 5707580.

It is an arithmetic number, because the mean of its divisors is an integer number (26635322).

Almost surely, 2^136981644 is an apocalyptic number.

It is an amenable number.

136981644 is an abundant number, since it is smaller than the sum of its proper divisors (182642220).

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

136981644 is a wasteful number, since it uses less digits than its factorization.

136981644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11415144 (or 11415142 counting only the distinct ones).

The product of its digits is 124416, while the sum is 42.

The square root of 136981644 is about 11703.9157549941. The cubic root of 136981644 is about 515.4906487504.

The spelling of 136981644 in words is "one hundred thirty-six million, nine hundred eighty-one thousand, six hundred forty-four".