478988509 has 4 divisors (see below), whose sum is σ = 479165500. Its totient is φ = 478811520.

The previous prime is 478988479. The next prime is 478988513. The reversal of 478988509 is 905889874.

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 202265284 + 276723225 = 14222^2 + 16635^2 .

It is a cyclic number.

It is not a de Polignac number, because 478988509 - 2⁷ = 478988381 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 (478988519) 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, 84372 + ... + 89869.

It is an arithmetic number, because the mean of its divisors is an integer number (119791375).

Almost surely, 2^478988509 is an apocalyptic number.

It is an amenable number.

478988509 is a deficient number, since it is larger than the sum of its proper divisors (176991).

478988509 is a wasteful number, since it uses less digits than its factorization.

478988509 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 176990.

The product of its (nonzero) digits is 5806080, while the sum is 58.

The square root of 478988509 is about 21885.8061080692. The cubic root of 478988509 is about 782.4231618250.

The spelling of 478988509 in words is "four hundred seventy-eight million, nine hundred eighty-eight thousand, five hundred nine".