63671871 has 4 divisors (see below), whose sum is σ = 84895832. Its totient is φ = 42447912.

The previous prime is 63671833. The next prime is 63671879. The reversal of 63671871 is 17817636.

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

It is not a de Polignac number, because 63671871 - 2⁶ = 63671807 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (63671879) 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, 10611976 + ... + 10611981.

It is an arithmetic number, because the mean of its divisors is an integer number (21223958).

Almost surely, 2^63671871 is an apocalyptic number.

63671871 is a deficient number, since it is larger than the sum of its proper divisors (21223961).

63671871 is a wasteful number, since it uses less digits than its factorization.

63671871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 21223960.

The product of its digits is 42336, while the sum is 39.

The square root of 63671871 is about 7979.4655836090. The cubic root of 63671871 is about 399.3152262981.

The spelling of 63671871 in words is "sixty-three million, six hundred seventy-one thousand, eight hundred seventy-one".