129446568 has 72 divisors (see below), whose sum is σ = 372480030. Its totient is φ = 40604160.

The previous prime is 129446519. The next prime is 129446573. The reversal of 129446568 is 865644921.

129446568 is a `hidden beast` number, since 129 + 4 + 465 + 68 = 666.

It can be written as a sum of positive squares in 3 ways, for example, as 110628324 + 18818244 = 10518^2 + 4338^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 17698 + ... + 23918.

Almost surely, 2^129446568 is an apocalyptic number.

129446568 is a gapful number since it is divisible by the number (18) 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 129446568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186240015).

129446568 is an abundant number, since it is smaller than the sum of its proper divisors (243033462).

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

129446568 is a wasteful number, since it uses less digits than its factorization.

129446568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6267 (or 6243 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 129446568 is about 11377.4587672292. The cubic root of 129446568 is about 505.8598142070.

The spelling of 129446568 in words is "one hundred twenty-nine million, four hundred forty-six thousand, five hundred sixty-eight".