129645687 has 16 divisors (see below), whose sum is σ = 180845568. Its totient is φ = 82457760.

The previous prime is 129645653. The next prime is 129645697. The reversal of 129645687 is 786546921.

It is not a de Polignac number, because 129645687 - 2⁶ = 129645623 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129645617) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 26818 + ... + 31280.

It is an arithmetic number, because the mean of its divisors is an integer number (11302848).

Almost surely, 2^129645687 is an apocalyptic number.

129645687 is a deficient number, since it is larger than the sum of its proper divisors (51199881).

129645687 is a wasteful number, since it uses less digits than its factorization.

129645687 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4910.

The product of its digits is 725760, while the sum is 48.

The square root of 129645687 is about 11386.2059967313. The cubic root of 129645687 is about 506.1190581024.

It can be divided in two parts, 129 and 645687, that added together give a triangular number (645816 = T₁₁₃₆).

The spelling of 129645687 in words is "one hundred twenty-nine million, six hundred forty-five thousand, six hundred eighty-seven".