129712536 has 64 divisors (see below), whose sum is σ = 365731200. Its totient is φ = 42587424.

The previous prime is 129712477. The next prime is 129712537. The reversal of 129712536 is 635217921.

It is a super-3 number, since 3×129712536³ (a number of 25 digits) contains 333 as substring.

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

It is a self number, because there is not a number n which added to its sum of digits gives 129712536.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129712537) 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, 9991 + ... + 18953.

It is an arithmetic number, because the mean of its divisors is an integer number (5714550).

Almost surely, 2^129712536 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 129712536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (182865600).

129712536 is an abundant number, since it is smaller than the sum of its proper divisors (236018664).

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

129712536 is a wasteful number, since it uses less digits than its factorization.

129712536 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9045 (or 9035 counting only the distinct ones).

The product of its digits is 22680, while the sum is 36.

The square root of 129712536 is about 11389.1411440898. The cubic root of 129712536 is about 506.2060329443.

The spelling of 129712536 in words is "one hundred twenty-nine million, seven hundred twelve thousand, five hundred thirty-six".