478320779 has 2 divisors, whose sum is σ = 478320780. Its totient is φ = 478320778.

The previous prime is 478320769. The next prime is 478320803. The reversal of 478320779 is 977023874.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-478320779 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (478320769) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 239160389 + 239160390.

It is an arithmetic number, because the mean of its divisors is an integer number (239160390).

Almost surely, 2^478320779 is an apocalyptic number.

478320779 is a deficient number, since it is larger than the sum of its proper divisors (1).

478320779 is an equidigital number, since it uses as much as digits as its factorization.

478320779 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 592704, while the sum is 47.

The square root of 478320779 is about 21870.5459236847. The cubic root of 478320779 is about 782.0594158844.

The spelling of 478320779 in words is "four hundred seventy-eight million, three hundred twenty thousand, seven hundred seventy-nine".