478646885 has 16 divisors (see below), whose sum is σ = 597648240. Its totient is φ = 367557120.

The previous prime is 478646873. The next prime is 478646887. The reversal of 478646885 is 588646874.

It is a Cunningham number, because it is equal to 21878²+1.

It can be written as a sum of positive squares in 8 ways, for example, as 1 + 478646884 = 1^2 + 21878^2 .

It is not a de Polignac number, because 478646885 - 2⁶ = 478646821 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 478646885.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478646887) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 15545 + ... + 34625.

It is an arithmetic number, because the mean of its divisors is an integer number (37353015).

Almost surely, 2^478646885 is an apocalyptic number.

It is an amenable number.

478646885 is a deficient number, since it is larger than the sum of its proper divisors (119001355).

478646885 is a wasteful number, since it uses less digits than its factorization.

478646885 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19288.

The product of its digits is 10321920, while the sum is 56.

The square root of 478646885 is about 21878.0000228540. Note that the first 4 decimals coincide. The cubic root of 478646885 is about 782.2371044026.

The spelling of 478646885 in words is "four hundred seventy-eight million, six hundred forty-six thousand, eight hundred eighty-five".