129720303900 has 288 divisors, whose sum is σ = 457268232960. Its totient is φ = 31286304000.

The previous prime is 129720303851. The next prime is 129720303901. The reversal of 129720303900 is 9303027921.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129720303901) by changing a digit.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 5839815 + ... + 5861985.

It is an arithmetic number, because the mean of its divisors is an integer number (1587736920).

Almost surely, 2^129720303900 is an apocalyptic number.

129720303900 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 129720303900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (228634116480).

129720303900 is an abundant number, since it is smaller than the sum of its proper divisors (327547929060).

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

129720303900 is a wasteful number, since it uses less digits than its factorization.

129720303900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22402 (or 22389 counting only the distinct ones).

The product of its (nonzero) digits is 20412, while the sum is 36.

The spelling of 129720303900 in words is "one hundred twenty-nine billion, seven hundred twenty million, three hundred three thousand, nine hundred".