129995000320 has 80 divisors (see below), whose sum is σ = 311802666120. Its totient is φ = 51978092544.

The previous prime is 129995000269. The next prime is 129995000321. The reversal of 129995000320 is 23000599921.

It can be written as a sum of positive squares in 4 ways, for example, as 51119401216 + 78875599104 = 226096^2 + 280848^2 .

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

It is a Harshad number since it is a multiple of its sum of digits (40).

It is not an unprimeable number, because it can be changed into a prime (129995000321) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 7950874 + ... + 7967206.

Almost surely, 2^129995000320 is an apocalyptic number.

129995000320 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 129995000320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (155901333060).

129995000320 is an abundant number, since it is smaller than the sum of its proper divisors (181807665800).

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

129995000320 is an equidigital number, since it uses as much as digits as its factorization.

129995000320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 19465 (or 19449 counting only the distinct ones).

The product of its (nonzero) digits is 43740, while the sum is 40.

The spelling of 129995000320 in words is "one hundred twenty-nine billion, nine hundred ninety-five million, three hundred twenty", and thus it is an aban number.