478691329 has 4 divisors (see below), whose sum is σ = 478746180. Its totient is φ = 478636480.

The previous prime is 478691309. The next prime is 478691333. The reversal of 478691329 is 923196874.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 923196874 = 2 ⋅461598437.

It can be written as a sum of positive squares in 2 ways, for example, as 180956304 + 297735025 = 13452^2 + 17255^2 .

It is a cyclic number.

It is not a de Polignac number, because 478691329 - 2¹⁵ = 478658561 is a prime.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478691309) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11092 + ... + 32869.

It is an arithmetic number, because the mean of its divisors is an integer number (119686545).

Almost surely, 2^478691329 is an apocalyptic number.

It is an amenable number.

478691329 is a deficient number, since it is larger than the sum of its proper divisors (54851).

478691329 is a wasteful number, since it uses less digits than its factorization.

478691329 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 54850.

The product of its digits is 653184, while the sum is 49.

The square root of 478691329 is about 21879.0157228336. The cubic root of 478691329 is about 782.2613147833.

The spelling of 478691329 in words is "four hundred seventy-eight million, six hundred ninety-one thousand, three hundred twenty-nine".