129760000 has 90 divisors (see below), whose sum is σ = 324061892. Its totient is φ = 51840000.

The previous prime is 129759989. The next prime is 129760009. The reversal of 129760000 is 67921.

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (129760009) by changing a digit.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 159595 + ... + 160405.

Almost surely, 2^129760000 is an apocalyptic number.

129760000 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 129760000, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (162030946).

129760000 is an abundant number, since it is smaller than the sum of its proper divisors (194301892).

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

129760000 is an frugal number, since it uses more digits than its factorization.

129760000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 847 (or 818 counting only the distinct ones).

The product of its (nonzero) digits is 756, while the sum is 25.

The square root of 129760000 is about 11391.2246927185. The cubic root of 129760000 is about 506.2677685172.

The spelling of 129760000 in words is "one hundred twenty-nine million, seven hundred sixty thousand".