63778920387 has 32 divisors (see below), whose sum is σ = 105838871040. Its totient is φ = 33263619840.

The previous prime is 63778920353. The next prime is 63778920419. The reversal of 63778920387 is 78302987736.

It is not a de Polignac number, because 63778920387 - 2²³ = 63770531779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63778920387.

It is not an unprimeable number, because it can be changed into a prime (63778920307) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1288189 + ... + 1336782.

It is an arithmetic number, because the mean of its divisors is an integer number (3307464720).

Almost surely, 2^63778920387 is an apocalyptic number.

63778920387 is a deficient number, since it is larger than the sum of its proper divisors (42059950653).

63778920387 is a wasteful number, since it uses less digits than its factorization.

63778920387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2625083.

The product of its (nonzero) digits is 21337344, while the sum is 60.

The spelling of 63778920387 in words is "sixty-three billion, seven hundred seventy-eight million, nine hundred twenty thousand, three hundred eighty-seven".