129645036 has 60 divisors (see below), whose sum is σ = 342120240. Its totient is φ = 42806880.

The previous prime is 129645031. The next prime is 129645053. The reversal of 129645036 is 630546921.

It is a happy number.

129645036 is a `hidden beast` number, since 1 + 2 + 9 + 645 + 0 + 3 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129645031) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 33481 + ... + 37151.

It is an arithmetic number, because the mean of its divisors is an integer number (5702004).

Almost surely, 2^129645036 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129645036, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171060120).

129645036 is an abundant number, since it is smaller than the sum of its proper divisors (212475204).

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

129645036 is a wasteful number, since it uses less digits than its factorization.

129645036 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3796 (or 3785 counting only the distinct ones).

The product of its (nonzero) digits is 38880, while the sum is 36.

The square root of 129645036 is about 11386.1774094733. The cubic root of 129645036 is about 506.1182109626.

The spelling of 129645036 in words is "one hundred twenty-nine million, six hundred forty-five thousand, thirty-six".