478720809 has 24 divisors (see below), whose sum is σ = 794036672. Its totient is φ = 272250720.

The previous prime is 478720807. The next prime is 478720813. The reversal of 478720809 is 908027874.

It is not a de Polignac number, because 478720809 - 2¹ = 478720807 is a prime.

It is a super-2 number, since 2×478720809² = 458347225939228962, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478720807) by changing a digit.

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 23 ways as a sum of consecutive naturals, for example, 4714 + ... + 31299.

Almost surely, 2^478720809 is an apocalyptic number.

It is an amenable number.

478720809 is a deficient number, since it is larger than the sum of its proper divisors (315315863).

478720809 is a wasteful number, since it uses less digits than its factorization.

478720809 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36237 (or 36234 counting only the distinct ones).

The product of its (nonzero) digits is 225792, while the sum is 45.

The square root of 478720809 is about 21879.6894173569. The cubic root of 478720809 is about 782.2773728627.

The spelling of 478720809 in words is "four hundred seventy-eight million, seven hundred twenty thousand, eight hundred nine".