129600726640 has 80 divisors (see below), whose sum is σ = 375673812480. Its totient is φ = 40395029760.

The previous prime is 129600726613. The next prime is 129600726679. The reversal of 129600726640 is 46627006921.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (80).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10513380 + ... + 10525699.

It is an arithmetic number, because the mean of its divisors is an integer number (4695922656).

Almost surely, 2^129600726640 is an apocalyptic number.

129600726640 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

129600726640 is an abundant number, since it is smaller than the sum of its proper divisors (246073085840).

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

129600726640 is a wasteful number, since it uses less digits than its factorization.

129600726640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21039110 (or 21039104 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 43.

The spelling of 129600726640 in words is "one hundred twenty-nine billion, six hundred million, seven hundred twenty-six thousand, six hundred forty".