129711045780 has 144 divisors (see below), whose sum is σ = 408093822864. Its totient is φ = 33321369600.

The previous prime is 129711045757. The next prime is 129711045791. The reversal of 129711045780 is 87540117921.

It is a happy number.

129711045780 is a `hidden beast` number, since 1 + 2 + 9 + 7 + 110 + 457 + 80 = 666.

It can be written as a sum of positive squares in 8 ways, for example, as 546998544 + 129164047236 = 23388^2 + 359394^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 576244 + ... + 769076.

It is an arithmetic number, because the mean of its divisors is an integer number (2833984881).

Almost surely, 2^129711045780 is an apocalyptic number.

129711045780 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 129711045780, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (204046911432).

129711045780 is an abundant number, since it is smaller than the sum of its proper divisors (278382777084).

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

129711045780 is a wasteful number, since it uses less digits than its factorization.

129711045780 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 192986 (or 192981 counting only the distinct ones).

The product of its (nonzero) digits is 141120, while the sum is 45.

The spelling of 129711045780 in words is "one hundred twenty-nine billion, seven hundred eleven million, forty-five thousand, seven hundred eighty".