129768432 has 40 divisors (see below), whose sum is σ = 335645184. Its totient is φ = 43203264.

The previous prime is 129768391. The next prime is 129768437. The reversal of 129768432 is 234867921.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129768437) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 70273 + ... + 72095.

Almost surely, 2^129768432 is an apocalyptic number.

129768432 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

129768432 is an abundant number, since it is smaller than the sum of its proper divisors (205876752).

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

129768432 is a wasteful number, since it uses less digits than its factorization.

129768432 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3317 (or 3311 counting only the distinct ones).

The product of its digits is 145152, while the sum is 42.

The square root of 129768432 is about 11391.5947961644. The cubic root of 129768432 is about 506.2787342934.

The spelling of 129768432 in words is "one hundred twenty-nine million, seven hundred sixty-eight thousand, four hundred thirty-two".