478748509 has 4 divisors (see below), whose sum is σ = 506910204. Its totient is φ = 450586816.

The previous prime is 478748507. The next prime is 478748521. The reversal of 478748509 is 905847874.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 302655609 + 176092900 = 17397^2 + 13270^2 .

It is a cyclic number.

It is not a de Polignac number, because 478748509 - 2¹ = 478748507 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (478748503) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14080822 + ... + 14080855.

It is an arithmetic number, because the mean of its divisors is an integer number (126727551).

Almost surely, 2^478748509 is an apocalyptic number.

It is an amenable number.

478748509 is a deficient number, since it is larger than the sum of its proper divisors (28161695).

478748509 is a wasteful number, since it uses less digits than its factorization.

478748509 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 28161694.

The product of its (nonzero) digits is 2257920, while the sum is 52.

The square root of 478748509 is about 21880.3224153576. The cubic root of 478748509 is about 782.2924607559.

The spelling of 478748509 in words is "four hundred seventy-eight million, seven hundred forty-eight thousand, five hundred nine".