136881644 has 24 divisors (see below), whose sum is σ = 244651680. Its totient is φ = 66996864.

The previous prime is 136881631. The next prime is 136881659. The reversal of 136881644 is 446188631.

It is a Smith number, since the sum of its digits (41) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 34802 + ... + 38534.

It is an arithmetic number, because the mean of its divisors is an integer number (10193820).

Almost surely, 2^136881644 is an apocalyptic number.

It is an amenable number.

136881644 is a deficient number, since it is larger than the sum of its proper divisors (107770036).

136881644 is a wasteful number, since it uses less digits than its factorization.

136881644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3929 (or 3927 counting only the distinct ones).

The product of its digits is 110592, while the sum is 41.

The square root of 136881644 is about 11699.6429005333. The cubic root of 136881644 is about 515.3651778905.

The spelling of 136881644 in words is "one hundred thirty-six million, eight hundred eighty-one thousand, six hundred forty-four".