63978984787 has 4 divisors (see below), whose sum is σ = 65708146576. Its totient is φ = 62249823000.

The previous prime is 63978984761. The next prime is 63978984827. The reversal of 63978984787 is 78748987936.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 63978984787 - 2¹⁹ = 63978460499 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63978984737) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 864580839 + ... + 864580912.

It is an arithmetic number, because the mean of its divisors is an integer number (16427036644).

Almost surely, 2^63978984787 is an apocalyptic number.

63978984787 is a deficient number, since it is larger than the sum of its proper divisors (1729161789).

63978984787 is a wasteful number, since it uses less digits than its factorization.

63978984787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1729161788.

The product of its digits is 1024192512, while the sum is 76.

The spelling of 63978984787 in words is "sixty-three billion, nine hundred seventy-eight million, nine hundred eighty-four thousand, seven hundred eighty-seven".