129023296500 has 288 divisors, whose sum is σ = 437729685120. Its totient is φ = 29445696000.

The previous prime is 129023296499. The next prime is 129023296553. The reversal of 129023296500 is 5692320921.

It is a super-2 number, since 2×129023296500² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 80187696 + ... + 80189304.

It is an arithmetic number, because the mean of its divisors is an integer number (1519894740).

Almost surely, 2^129023296500 is an apocalyptic number.

129023296500 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 129023296500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (218864842560).

129023296500 is an abundant number, since it is smaller than the sum of its proper divisors (308706388620).

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

129023296500 is a wasteful number, since it uses less digits than its factorization.

129023296500 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2736 (or 2717 counting only the distinct ones).

The product of its (nonzero) digits is 58320, while the sum is 39.

The spelling of 129023296500 in words is "one hundred twenty-nine billion, twenty-three million, two hundred ninety-six thousand, five hundred".