129036478 has 4 divisors (see below), whose sum is σ = 193554720. Its totient is φ = 64518238.

The previous prime is 129036473. The next prime is 129036487. The reversal of 129036478 is 874630921.

It is a semiprime because it is the product of two primes.

It is a Smith number, since the sum of its digits (40) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a self number, because there is not a number n which added to its sum of digits gives 129036478.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (129036473) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 32259118 + ... + 32259121.

It is an arithmetic number, because the mean of its divisors is an integer number (48388680).

Almost surely, 2^129036478 is an apocalyptic number.

129036478 is a deficient number, since it is larger than the sum of its proper divisors (64518242).

129036478 is an equidigital number, since it uses as much as digits as its factorization.

129036478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 64518241.

The product of its (nonzero) digits is 72576, while the sum is 40.

The square root of 129036478 is about 11359.4224325007. The cubic root of 129036478 is about 505.3250568739.

The spelling of 129036478 in words is "one hundred twenty-nine million, thirty-six thousand, four hundred seventy-eight".