129736778880 has 512 divisors, whose sum is σ = 450087321600. Its totient is φ = 31677972480.

The previous prime is 129736778867. The next prime is 129736778959. The reversal of 129736778880 is 88877637921.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 189951019 + ... + 189951701.

It is an arithmetic number, because the mean of its divisors is an integer number (879076800).

Almost surely, 2^129736778880 is an apocalyptic number.

129736778880 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 129736778880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (225043660800).

129736778880 is an abundant number, since it is smaller than the sum of its proper divisors (320350542720).

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

129736778880 is a wasteful number, since it uses less digits than its factorization.

129736778880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 892 (or 880 counting only the distinct ones).

The product of its (nonzero) digits is 56899584, while the sum is 66.

The spelling of 129736778880 in words is "one hundred twenty-nine billion, seven hundred thirty-six million, seven hundred seventy-eight thousand, eight hundred eighty".