478163988 has 18 divisors (see below), whose sum is σ = 1208692394. Its totient is φ = 159387984.

The previous prime is 478163969. The next prime is 478163989. The reversal of 478163988 is 889361874.

478163988 is a `hidden beast` number, since 478 + 163 + 9 + 8 + 8 = 666.

It can be written as a sum of positive squares in only one way, i.e., 460875024 + 17288964 = 21468^2 + 4158^2 .

It is a tau number, because it is divible by the number of its divisors (18).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478163989) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6641131 + ... + 6641202.

Almost surely, 2^478163988 is an apocalyptic number.

It is an amenable number.

478163988 is an abundant number, since it is smaller than the sum of its proper divisors (730528406).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

478163988 is a wasteful number, since it uses less digits than its factorization.

478163988 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13282343 (or 13282338 counting only the distinct ones).

The product of its digits is 2322432, while the sum is 54.

The square root of 478163988 is about 21866.9611057412. The cubic root of 478163988 is about 781.9739549108.

The spelling of 478163988 in words is "four hundred seventy-eight million, one hundred sixty-three thousand, nine hundred eighty-eight".