63878567 has 4 divisors (see below), whose sum is σ = 66655920. Its totient is φ = 61101216.

The previous prime is 63878557. The next prime is 63878599. The reversal of 63878567 is 76587836.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63878567 is a prime.

It is an alternating number because its digits alternate between even and odd.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63878557) 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, 1388642 + ... + 1388687.

It is an arithmetic number, because the mean of its divisors is an integer number (16663980).

Almost surely, 2^63878567 is an apocalyptic number.

63878567 is a deficient number, since it is larger than the sum of its proper divisors (2777353).

63878567 is a wasteful number, since it uses less digits than its factorization.

63878567 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2777352.

The product of its digits is 1693440, while the sum is 50.

The square root of 63878567 is about 7992.4068339894. The cubic root of 63878567 is about 399.7468544104.

The spelling of 63878567 in words is "sixty-three million, eight hundred seventy-eight thousand, five hundred sixty-seven".