129787988 has 72 divisors (see below), whose sum is σ = 265446720. Its totient is φ = 55369600.

The previous prime is 129787969. The next prime is 129787991. The reversal of 129787988 is 889787921.

129787988 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

Its product of digits (4064256) is a multiple of the sum of its prime divisors (256).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 990683 + ... + 990813.

It is an arithmetic number, because the mean of its divisors is an integer number (3686760).

Almost surely, 2^129787988 is an apocalyptic number.

It is an amenable number.

129787988 is an abundant number, since it is smaller than the sum of its proper divisors (135658732).

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

129787988 is a wasteful number, since it uses less digits than its factorization.

129787988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 269 (or 256 counting only the distinct ones).

The product of its digits is 4064256, while the sum is 59.

The square root of 129787988 is about 11392.4531159887. The cubic root of 129787988 is about 506.3041649509.

The spelling of 129787988 in words is "one hundred twenty-nine million, seven hundred eighty-seven thousand, nine hundred eighty-eight".