63478777 has 2 divisors, whose sum is σ = 63478778. Its totient is φ = 63478776.

The previous prime is 63478771. The next prime is 63478787. The reversal of 63478777 is 77787436.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 37100281 + 26378496 = 6091^2 + 5136^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63478777 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63478777.

It is not a weakly prime, because it can be changed into another prime (63478771) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31739388 + 31739389.

It is an arithmetic number, because the mean of its divisors is an integer number (31739389).

Almost surely, 2^63478777 is an apocalyptic number.

It is an amenable number.

63478777 is a deficient number, since it is larger than the sum of its proper divisors (1).

63478777 is an equidigital number, since it uses as much as digits as its factorization.

63478777 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1382976, while the sum is 49.

The square root of 63478777 is about 7967.3569645146. The cubic root of 63478777 is about 398.9111574944.

The spelling of 63478777 in words is "sixty-three million, four hundred seventy-eight thousand, seven hundred seventy-seven".