478665569 has 8 divisors (see below), whose sum is σ = 482040552. Its totient is φ = 475297920.

The previous prime is 478665557. The next prime is 478665571. The reversal of 478665569 is 965566874.

It is a happy number.

It can be written as a sum of positive squares in 4 ways, for example, as 70140625 + 408524944 = 8375^2 + 20212^2 .

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 478665569 - 2²⁸ = 210230113 is a prime.

It is a super-2 number, since 2×478665569² = 458241453892187522, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478665169) 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, 208709 + ... + 210989.

It is an arithmetic number, because the mean of its divisors is an integer number (60255069).

Almost surely, 2^478665569 is an apocalyptic number.

It is an amenable number.

478665569 is a deficient number, since it is larger than the sum of its proper divisors (3374983).

478665569 is a wasteful number, since it uses less digits than its factorization.

478665569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3667.

The product of its digits is 10886400, while the sum is 56.

The square root of 478665569 is about 21878.4270229832. The cubic root of 478665569 is about 782.2472824889.

It can be divided in two parts, 47866 and 5569, that added together give a palindrome (53435).

The spelling of 478665569 in words is "four hundred seventy-eight million, six hundred sixty-five thousand, five hundred sixty-nine".