129235664 has 20 divisors (see below), whose sum is σ = 250637604. Its totient is φ = 64555008.

The previous prime is 129235627. The next prime is 129235669. The reversal of 129235664 is 466532921.

It can be written as a sum of positive squares in 2 ways, for example, as 16875664 + 112360000 = 4108^2 + 10600^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129235669) 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 3 ways as a sum of consecutive naturals, for example, 16154 + ... + 22790.

Almost surely, 2^129235664 is an apocalyptic number.

It is an amenable number.

129235664 is a deficient number, since it is larger than the sum of its proper divisors (121401940).

129235664 is a wasteful number, since it uses less digits than its factorization.

129235664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7862 (or 7856 counting only the distinct ones).

The product of its digits is 77760, while the sum is 38.

The square root of 129235664 is about 11368.1864868588. The cubic root of 129235664 is about 505.5849366940.

The spelling of 129235664 in words is "one hundred twenty-nine million, two hundred thirty-five thousand, six hundred sixty-four".