63959778 has 12 divisors (see below), whose sum is σ = 138579558. Its totient is φ = 21319920.

The previous prime is 63959773. The next prime is 63959813. The reversal of 63959778 is 87795936.

It can be written as a sum of positive squares in only one way, i.e., 42029289 + 21930489 = 6483^2 + 4683^2 .

It is not an unprimeable number, because it can be changed into a prime (63959771) 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 in 5 ways as a sum of consecutive naturals, for example, 1776643 + ... + 1776678.

Almost surely, 2^63959778 is an apocalyptic number.

63959778 is an abundant number, since it is smaller than the sum of its proper divisors (74619780).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

63959778 is a wasteful number, since it uses less digits than its factorization.

63959778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3553329 (or 3553326 counting only the distinct ones).

The product of its digits is 2857680, while the sum is 54.

The square root of 63959778 is about 7997.4857299029. The cubic root of 63959778 is about 399.9161866062.

The spelling of 63959778 in words is "sixty-three million, nine hundred fifty-nine thousand, seven hundred seventy-eight".