478305257 has 4 divisors (see below), whose sum is σ = 479441796. Its totient is φ = 477168720.

The previous prime is 478305197. The next prime is 478305277. The reversal of 478305257 is 752503874.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 752503874 = 2 ⋅376251937.

It can be written as a sum of positive squares in 2 ways, for example, as 5851561 + 472453696 = 2419^2 + 21736^2 .

It is a cyclic number.

It is not a de Polignac number, because 478305257 - 2¹⁶ = 478239721 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (478305277) 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, 567638 + ... + 568479.

It is an arithmetic number, because the mean of its divisors is an integer number (119860449).

Almost surely, 2^478305257 is an apocalyptic number.

It is an amenable number.

478305257 is a deficient number, since it is larger than the sum of its proper divisors (1136539).

478305257 is a wasteful number, since it uses less digits than its factorization.

478305257 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1136538.

The product of its (nonzero) digits is 235200, while the sum is 41.

The square root of 478305257 is about 21870.1910599793. The cubic root of 478305257 is about 782.0509562494.

The spelling of 478305257 in words is "four hundred seventy-eight million, three hundred five thousand, two hundred fifty-seven".