129456478 has 8 divisors (see below), whose sum is σ = 194290200. Its totient is φ = 64693080.

The previous prime is 129456461. The next prime is 129456497. The reversal of 129456478 is 874654921.

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, 12708 + ... + 20503.

It is an arithmetic number, because the mean of its divisors is an integer number (24286275).

Almost surely, 2^129456478 is an apocalyptic number.

129456478 is a deficient number, since it is larger than the sum of its proper divisors (64833722).

129456478 is a wasteful number, since it uses less digits than its factorization.

129456478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35162.

The product of its digits is 483840, while the sum is 46.

The square root of 129456478 is about 11377.8942691519. The cubic root of 129456478 is about 505.8727228609.

The spelling of 129456478 in words is "one hundred twenty-nine million, four hundred fifty-six thousand, four hundred seventy-eight".