129747880 has 16 divisors (see below), whose sum is σ = 291932820. Its totient is φ = 51899136.

The previous prime is 129747857. The next prime is 129747887. The reversal of 129747880 is 88747921.

It can be written as a sum of positive squares in 2 ways, for example, as 118417924 + 11329956 = 10882^2 + 3366^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 129747880.

It is not an unprimeable number, because it can be changed into a prime (129747887) 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, 1621809 + ... + 1621888.

Almost surely, 2^129747880 is an apocalyptic number.

129747880 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129747880 is an abundant number, since it is smaller than the sum of its proper divisors (162184940).

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

129747880 is a wasteful number, since it uses less digits than its factorization.

129747880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3243708 (or 3243704 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 129747880 is about 11390.6926918428. The cubic root of 129747880 is about 506.2520056822.

The spelling of 129747880 in words is "one hundred twenty-nine million, seven hundred forty-seven thousand, eight hundred eighty".