63678971 has 4 divisors (see below), whose sum is σ = 63697272. Its totient is φ = 63660672.

The previous prime is 63678959. The next prime is 63678997. The reversal of 63678971 is 17987636.

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 63678971 - 2⁶ = 63678907 is a prime.

It is a super-2 number, since 2×63678971² = 8110022695237682, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (63678931) 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, 2141 + ... + 11486.

It is an arithmetic number, because the mean of its divisors is an integer number (15924318).

Almost surely, 2^63678971 is an apocalyptic number.

63678971 is a deficient number, since it is larger than the sum of its proper divisors (18301).

63678971 is a wasteful number, since it uses less digits than its factorization.

63678971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18300.

The product of its digits is 381024, while the sum is 47.

The square root of 63678971 is about 7979.9104631568. The cubic root of 63678971 is about 399.3300681882.

The spelling of 63678971 in words is "sixty-three million, six hundred seventy-eight thousand, nine hundred seventy-one".