63667878 has 8 divisors (see below), whose sum is σ = 127335768. Its totient is φ = 21222624.

The previous prime is 63667871. The next prime is 63667897. The reversal of 63667878 is 87876636.

It is a sphenic number, since it is the product of 3 distinct primes.

63667878 is an admirable number.

It is a self number, because there is not a number n which added to its sum of digits gives 63667878.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63667871) 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 3 ways as a sum of consecutive naturals, for example, 5305651 + ... + 5305662.

It is an arithmetic number, because the mean of its divisors is an integer number (15916971).

Almost surely, 2^63667878 is an apocalyptic number.

63667878 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

63667878 is a wasteful number, since it uses less digits than its factorization.

63667878 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10611318.

The product of its digits is 2032128, while the sum is 51.

The square root of 63667878 is about 7979.2153749601. The cubic root of 63667878 is about 399.3068788180.

It can be divided in two parts, 636678 and 78, that added together give a triangular number (636756 = T₁₁₂₈).

The spelling of 63667878 in words is "sixty-three million, six hundred sixty-seven thousand, eight hundred seventy-eight".