478172089 has 4 divisors (see below), whose sum is σ = 478462324. Its totient is φ = 477881856.

The previous prime is 478172087. The next prime is 478172111. The reversal of 478172089 is 980271874.

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

It can be written as a sum of positive squares in 2 ways, for example, as 153884025 + 324288064 = 12405^2 + 18008^2 .

It is a cyclic number.

It is not a de Polignac number, because 478172089 - 2¹ = 478172087 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478172087) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142632 + ... + 145945.

It is an arithmetic number, because the mean of its divisors is an integer number (119615581).

Almost surely, 2^478172089 is an apocalyptic number.

It is an amenable number.

478172089 is a deficient number, since it is larger than the sum of its proper divisors (290235).

478172089 is a wasteful number, since it uses less digits than its factorization.

478172089 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 290234.

The product of its (nonzero) digits is 225792, while the sum is 46.

The square root of 478172089 is about 21867.1463387430. The cubic root of 478172089 is about 781.9783709239.

The spelling of 478172089 in words is "four hundred seventy-eight million, one hundred seventy-two thousand, eighty-nine".