129985678 has 8 divisors (see below), whose sum is σ = 195172920. Its totient is φ = 64928040.

The previous prime is 129985637. The next prime is 129985727. The reversal of 129985678 is 876589921.

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

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, 29853 + ... + 33928.

It is an arithmetic number, because the mean of its divisors is an integer number (24396615).

Almost surely, 2^129985678 is an apocalyptic number.

129985678 is a deficient number, since it is larger than the sum of its proper divisors (65187242).

129985678 is a wasteful number, since it uses less digits than its factorization.

129985678 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64802.

The product of its digits is 2177280, while the sum is 55.

The square root of 129985678 is about 11401.1261724445. The cubic root of 129985678 is about 506.5610980615.

The spelling of 129985678 in words is "one hundred twenty-nine million, nine hundred eighty-five thousand, six hundred seventy-eight".