63778399 has 2 divisors, whose sum is σ = 63778400. Its totient is φ = 63778398.

The previous prime is 63778397. The next prime is 63778409. The reversal of 63778399 is 99387736.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63778399 - 2¹ = 63778397 is a prime.

Together with 63778397, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63778397) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31889199 + 31889200.

It is an arithmetic number, because the mean of its divisors is an integer number (31889200).

Almost surely, 2^63778399 is an apocalyptic number.

63778399 is a deficient number, since it is larger than the sum of its proper divisors (1).

63778399 is an equidigital number, since it uses as much as digits as its factorization.

63778399 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1714608, while the sum is 52.

The square root of 63778399 is about 7986.1379276844. The cubic root of 63778399 is about 399.5377973775.

The spelling of 63778399 in words is "sixty-three million, seven hundred seventy-eight thousand, three hundred ninety-nine".