478678637 has 2 divisors, whose sum is σ = 478678638. Its totient is φ = 478678636.

The previous prime is 478678561. The next prime is 478678687. The reversal of 478678637 is 736876874.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 342583081 + 136095556 = 18509^2 + 11666^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478678637 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (478678687) 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, 239339318 + 239339319.

It is an arithmetic number, because the mean of its divisors is an integer number (239339319).

Almost surely, 2^478678637 is an apocalyptic number.

It is an amenable number.

478678637 is a deficient number, since it is larger than the sum of its proper divisors (1).

478678637 is an equidigital number, since it uses as much as digits as its factorization.

478678637 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9483264, while the sum is 56.

The square root of 478678637 is about 21878.7256713000. The cubic root of 478678637 is about 782.2544011086.

The spelling of 478678637 in words is "four hundred seventy-eight million, six hundred seventy-eight thousand, six hundred thirty-seven".