129067992 has 72 divisors (see below), whose sum is σ = 363132900. Its totient is φ = 43005168.

The previous prime is 129067979. The next prime is 129067997. The reversal of 129067992 is 299760921.

It is a tau number, because it is divible by the number of its divisors (72).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129067997) by changing a digit.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 51259 + ... + 53717.

Almost surely, 2^129067992 is an apocalyptic number.

129067992 is a gapful number since it is divisible by the number (12) 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 129067992, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (181566450).

129067992 is an abundant number, since it is smaller than the sum of its proper divisors (234064908).

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

129067992 is an frugal number, since it uses more digits than its factorization.

129067992 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2489 (or 2464 counting only the distinct ones).

The product of its (nonzero) digits is 122472, while the sum is 45.

The square root of 129067992 is about 11360.8094782018. The cubic root of 129067992 is about 505.3661912824.

The spelling of 129067992 in words is "one hundred twenty-nine million, sixty-seven thousand, nine hundred ninety-two".