63878647 has 4 divisors (see below), whose sum is σ = 73004176. Its totient is φ = 54753120.

The previous prime is 63878641. The next prime is 63878653. The reversal of 63878647 is 74687836.

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

It is an interprime number because it is at equal distance from previous prime (63878641) and next prime (63878653).

It is a cyclic number.

It is not a de Polignac number, because 63878647 - 2⁷ = 63878519 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63878647.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63878641) 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 3 ways as a sum of consecutive naturals, for example, 4562754 + ... + 4562767.

It is an arithmetic number, because the mean of its divisors is an integer number (18251044).

Almost surely, 2^63878647 is an apocalyptic number.

63878647 is a deficient number, since it is larger than the sum of its proper divisors (9125529).

63878647 is an equidigital number, since it uses as much as digits as its factorization.

63878647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9125528.

The product of its digits is 1354752, while the sum is 49.

The square root of 63878647 is about 7992.4118387380. The cubic root of 63878647 is about 399.7470212882.

The spelling of 63878647 in words is "sixty-three million, eight hundred seventy-eight thousand, six hundred forty-seven".