129988878 has 8 divisors (see below), whose sum is σ = 259977768. Its totient is φ = 43329624.

The previous prime is 129988877. The next prime is 129988879. The reversal of 129988878 is 878889921.

It is an interprime number because it is at equal distance from previous prime (129988877) and next prime (129988879).

It is a sphenic number, since it is the product of 3 distinct primes.

129988878 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129988877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10832401 + ... + 10832412.

It is an arithmetic number, because the mean of its divisors is an integer number (32497221).

Almost surely, 2^129988878 is an apocalyptic number.

129988878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

129988878 is a wasteful number, since it uses less digits than its factorization.

129988878 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21664818.

The product of its digits is 4644864, while the sum is 60.

The square root of 129988878 is about 11401.2665085946. The cubic root of 129988878 is about 506.5652548841.

The spelling of 129988878 in words is "one hundred twenty-nine million, nine hundred eighty-eight thousand, eight hundred seventy-eight".