129768478 has 8 divisors (see below), whose sum is σ = 222460272. Its totient is φ = 55615056.

The previous prime is 129768439. The next prime is 129768487. The reversal of 129768478 is 874867921.

129768478 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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, 4634575 + ... + 4634602.

It is an arithmetic number, because the mean of its divisors is an integer number (27807534).

Almost surely, 2^129768478 is an apocalyptic number.

129768478 is a deficient number, since it is larger than the sum of its proper divisors (92691794).

129768478 is an equidigital number, since it uses as much as digits as its factorization.

129768478 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9269186.

The product of its digits is 1354752, while the sum is 52.

The square root of 129768478 is about 11391.5968151967. The cubic root of 129768478 is about 506.2787941149.

The spelling of 129768478 in words is "one hundred twenty-nine million, seven hundred sixty-eight thousand, four hundred seventy-eight".