129078492544 has 128 divisors (see below), whose sum is σ = 269409254400. Its totient is φ = 61551415296.

The previous prime is 129078492539. The next prime is 129078492547. The reversal of 129078492544 is 445294870921.

It is a tau number, because it is divible by the number of its divisors (128).

It is a super-2 number, since 2×129078492544² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129078492547) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 41383017 + ... + 41386135.

It is an arithmetic number, because the mean of its divisors is an integer number (2104759800).

Almost surely, 2^129078492544 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 129078492544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (134704627200).

129078492544 is an abundant number, since it is smaller than the sum of its proper divisors (140330761856).

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

129078492544 is a wasteful number, since it uses less digits than its factorization.

129078492544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3352 (or 3340 counting only the distinct ones).

The product of its (nonzero) digits is 5806080, while the sum is 55.

The spelling of 129078492544 in words is "one hundred twenty-nine billion, seventy-eight million, four hundred ninety-two thousand, five hundred forty-four".