478690657 has 2 divisors, whose sum is σ = 478690658. Its totient is φ = 478690656.

The previous prime is 478690649. The next prime is 478690673. The reversal of 478690657 is 756096874.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 478690641 + 16 = 21879^2 + 4^2 .

It is a cyclic number.

It is not a de Polignac number, because 478690657 - 2³ = 478690649 is a prime.

It is not a weakly prime, because it can be changed into another prime (478690627) 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 as a sum of consecutive naturals, namely, 239345328 + 239345329.

It is an arithmetic number, because the mean of its divisors is an integer number (239345329).

Almost surely, 2^478690657 is an apocalyptic number.

It is an amenable number.

478690657 is a deficient number, since it is larger than the sum of its proper divisors (1).

478690657 is an equidigital number, since it uses as much as digits as its factorization.

478690657 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 52.

The square root of 478690657 is about 21879.0003656474. Note that the first 3 decimals coincide. The cubic root of 478690657 is about 782.2609487298.

It can be divided in two parts, 47 and 8690657, that added together give a square (8690704 = 2948²).

The spelling of 478690657 in words is "four hundred seventy-eight million, six hundred ninety thousand, six hundred fifty-seven".