129807750 has 64 divisors (see below), whose sum is σ = 343092672. Its totient is φ = 32576000.

The previous prime is 129807739. The next prime is 129807751. The reversal of 129807750 is 57708921.

It is a Smith number, since the sum of its digits (39) coincides with the sum of the digits of its prime factors.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 129807699 and 129807708.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129807751) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 7660 + ... + 17840.

It is an arithmetic number, because the mean of its divisors is an integer number (5360823).

Almost surely, 2^129807750 is an apocalyptic number.

129807750 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 129807750, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (171546336).

129807750 is an abundant number, since it is smaller than the sum of its proper divisors (213284922).

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

129807750 is a wasteful number, since it uses less digits than its factorization.

129807750 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 10218 (or 10208 counting only the distinct ones).

The product of its (nonzero) digits is 35280, while the sum is 39.

The square root of 129807750 is about 11393.3204115394. The cubic root of 129807750 is about 506.3298608962.

The spelling of 129807750 in words is "one hundred twenty-nine million, eight hundred seven thousand, seven hundred fifty".