478921777 has 2 divisors, whose sum is σ = 478921778. Its totient is φ = 478921776.

The previous prime is 478921763. The next prime is 478921783. The reversal of 478921777 is 777129874.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 478909456 + 12321 = 21884^2 + 111^2 .

It is a cyclic number.

It is not a de Polignac number, because 478921777 - 2¹⁵ = 478889009 is a prime.

It is not a weakly prime, because it can be changed into another prime (478921757) 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, 239460888 + 239460889.

It is an arithmetic number, because the mean of its divisors is an integer number (239460889).

Almost surely, 2^478921777 is an apocalyptic number.

It is an amenable number.

478921777 is a deficient number, since it is larger than the sum of its proper divisors (1).

478921777 is an equidigital number, since it uses as much as digits as its factorization.

478921777 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1382976, while the sum is 52.

The square root of 478921777 is about 21884.2815052265. The cubic root of 478921777 is about 782.3868247756.

The spelling of 478921777 in words is "four hundred seventy-eight million, nine hundred twenty-one thousand, seven hundred seventy-seven".