478986649 has 4 divisors (see below), whose sum is σ = 495503460. Its totient is φ = 462469840.

The previous prime is 478986617. The next prime is 478986659. The reversal of 478986649 is 946689874.

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 156425049 + 322561600 = 12507^2 + 17960^2 .

It is a cyclic number.

It is not a de Polignac number, because 478986649 - 2⁵ = 478986617 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478986659) 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 3 ways as a sum of consecutive naturals, for example, 8258362 + ... + 8258419.

It is an arithmetic number, because the mean of its divisors is an integer number (123875865).

Almost surely, 2^478986649 is an apocalyptic number.

It is an amenable number.

478986649 is a deficient number, since it is larger than the sum of its proper divisors (16516811).

478986649 is a wasteful number, since it uses less digits than its factorization.

478986649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 16516810.

The product of its digits is 20901888, while the sum is 61.

The square root of 478986649 is about 21885.7636147337. The cubic root of 478986649 is about 782.4221490596.

The spelling of 478986649 in words is "four hundred seventy-eight million, nine hundred eighty-six thousand, six hundred forty-nine".