478669 has 8 divisors (see below), whose sum is σ = 521208. Its totient is φ = 437760.

The previous prime is 478651. The next prime is 478679. The reversal of 478669 is 966874.

478669 = T₁₄₂ + T₁₄₃ + ... + T₁₇₈.

It can be written as a sum of positive squares in 4 ways, for example, as 72900 + 405769 = 270^2 + 637^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 478669 - 2⁵ = 478637 is a prime.

It is a super-2 number, since 2×478669² = 458248023122, which contains 22 as substring.

It is an Ulam number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478679) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 249 + ... + 1009.

It is an arithmetic number, because the mean of its divisors is an integer number (65151).

2⁴⁷⁸⁶⁶⁹ is an apocalyptic number.

It is an amenable number.

478669 is a deficient number, since it is larger than the sum of its proper divisors (42539).

478669 is a wasteful number, since it uses less digits than its factorization.

478669 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 815.

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

The square root of 478669 is about 691.8590896996. The cubic root of 478669 is about 78.2249151493.

The spelling of 478669 in words is "four hundred seventy-eight thousand, six hundred sixty-nine".