63671947 has 4 divisors (see below), whose sum is σ = 63816120. Its totient is φ = 63527776.

The previous prime is 63671941. The next prime is 63671957. The reversal of 63671947 is 74917636.

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

It is a cyclic number.

It is not a de Polignac number, because 63671947 - 2¹⁵ = 63639179 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63671941) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 71422 + ... + 72307.

It is an arithmetic number, because the mean of its divisors is an integer number (15954030).

Almost surely, 2^63671947 is an apocalyptic number.

63671947 is a deficient number, since it is larger than the sum of its proper divisors (144173).

63671947 is a wasteful number, since it uses less digits than its factorization.

63671947 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 144172.

The product of its digits is 190512, while the sum is 43.

The square root of 63671947 is about 7979.4703458312. The cubic root of 63671947 is about 399.3153851748.

The spelling of 63671947 in words is "sixty-three million, six hundred seventy-one thousand, nine hundred forty-seven".