478666 has 4 divisors (see below), whose sum is σ = 718002. Its totient is φ = 239332.

The previous prime is 478651. The next prime is 478679. The reversal of 478666 is 666874.

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

It can be written as a sum of positive squares in only one way, i.e., 385641 + 93025 = 621^2 + 305^2 .

It is a super-2 number, since 2×478666² = 458242279112, which contains 22 as substring.

478666 is a modest number, since divided by 666 gives 478 as remainder.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 119665 + ... + 119668.

2⁴⁷⁸⁶⁶⁶ is an apocalyptic number.

478666 is a deficient number, since it is larger than the sum of its proper divisors (239336).

478666 is a wasteful number, since it uses less digits than its factorization.

478666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 239335.

The product of its digits is 48384, while the sum is 37.

The square root of 478666 is about 691.8569216247. The cubic root of 478666 is about 78.2247517272.

The spelling of 478666 in words is "four hundred seventy-eight thousand, six hundred sixty-six".