478820645 has 4 divisors (see below), whose sum is σ = 574584780. Its totient is φ = 383056512.

The previous prime is 478820633. The next prime is 478820669. The reversal of 478820645 is 546028874.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 546028874 = 2 ⋅273014437.

It can be written as a sum of positive squares in 2 ways, for example, as 62742241 + 416078404 = 7921^2 + 20398^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478820645 is a prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 478820596 and 478820605.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 47882060 + ... + 47882069.

It is an arithmetic number, because the mean of its divisors is an integer number (143646195).

Almost surely, 2^478820645 is an apocalyptic number.

It is an amenable number.

478820645 is a deficient number, since it is larger than the sum of its proper divisors (95764135).

478820645 is an equidigital number, since it uses as much as digits as its factorization.

478820645 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 95764134.

The product of its (nonzero) digits is 430080, while the sum is 44.

The square root of 478820645 is about 21881.9707750467. The cubic root of 478820645 is about 782.3317497311.

The spelling of 478820645 in words is "four hundred seventy-eight million, eight hundred twenty thousand, six hundred forty-five".