129276368 has 20 divisors (see below), whose sum is σ = 269740548. Its totient is φ = 59665920.

The previous prime is 129276359. The next prime is 129276373. The reversal of 129276368 is 863672921.

It can be written as a sum of positive squares in 2 ways, for example, as 20866624 + 108409744 = 4568^2 + 10412^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310553 + ... + 310968.

Almost surely, 2^129276368 is an apocalyptic number.

It is an amenable number.

129276368 is an abundant number, since it is smaller than the sum of its proper divisors (140464180).

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

129276368 is a wasteful number, since it uses less digits than its factorization.

129276368 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621542 (or 621536 counting only the distinct ones).

The product of its digits is 217728, while the sum is 44.

The square root of 129276368 is about 11369.9766050771. The cubic root of 129276368 is about 505.6380107152.

The spelling of 129276368 in words is "one hundred twenty-nine million, two hundred seventy-six thousand, three hundred sixty-eight".