478256809 has 8 divisors (see below), whose sum is σ = 519668480. Its totient is φ = 438469200.

The previous prime is 478256803. The next prime is 478256813. The reversal of 478256809 is 908652874.

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 478256809 - 2⁹ = 478256297 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478256803) 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, 405402 + ... + 406579.

It is an arithmetic number, because the mean of its divisors is an integer number (64958560).

Almost surely, 2^478256809 is an apocalyptic number.

It is an amenable number.

478256809 is a deficient number, since it is larger than the sum of its proper divisors (41411671).

478256809 is a wasteful number, since it uses less digits than its factorization.

478256809 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 812031.

The product of its (nonzero) digits is 967680, while the sum is 49.

The square root of 478256809 is about 21869.0834055751. The cubic root of 478256809 is about 782.0245504597.

The spelling of 478256809 in words is "four hundred seventy-eight million, two hundred fifty-six thousand, eight hundred nine".