478390257 has 6 divisors (see below), whose sum is σ = 691008162. Its totient is φ = 318926832.

The previous prime is 478390223. The next prime is 478390291. The reversal of 478390257 is 752093874.

478390257 is a `hidden beast` number, since 4 + 7 + 8 + 390 + 257 = 666.

It is an interprime number because it is at equal distance from previous prime (478390223) and next prime (478390291).

It can be written as a sum of positive squares in only one way, i.e., 385768881 + 92621376 = 19641^2 + 9624^2 .

It is not a de Polignac number, because 478390257 - 2¹⁴ = 478373873 is a prime.

It is not an unprimeable number, because it can be changed into a prime (478390207) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 26577228 + ... + 26577245.

It is an arithmetic number, because the mean of its divisors is an integer number (115168027).

Almost surely, 2^478390257 is an apocalyptic number.

It is an amenable number.

478390257 is a deficient number, since it is larger than the sum of its proper divisors (212617905).

478390257 is a wasteful number, since it uses less digits than its factorization.

478390257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 53154479 (or 53154476 counting only the distinct ones).

The product of its (nonzero) digits is 423360, while the sum is 45.

The square root of 478390257 is about 21872.1342580005. The cubic root of 478390257 is about 782.0972798004.

The spelling of 478390257 in words is "four hundred seventy-eight million, three hundred ninety thousand, two hundred fifty-seven".