8640447963 has 8 divisors (see below), whose sum is σ = 13166396928. Its totient is φ = 4937398824.

The previous prime is 8640447941. The next prime is 8640447979. The reversal of 8640447963 is 3697440468.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 8640447963 - 2⁹ = 8640447451 is a prime.

It is a super-3 number, since 3×8640447963³ (a number of 31 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (8640447463) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 205724931 + ... + 205724972.

It is an arithmetic number, because the mean of its divisors is an integer number (1645799616).

Almost surely, 2^8640447963 is an apocalyptic number.

8640447963 is a deficient number, since it is larger than the sum of its proper divisors (4525948965).

8640447963 is a wasteful number, since it uses less digits than its factorization.

8640447963 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 411449913.

The product of its (nonzero) digits is 3483648, while the sum is 51.

The square root of 8640447963 is about 92954.0099350211. The cubic root of 8640447963 is about 2052.0065986378.

The spelling of 8640447963 in words is "eight billion, six hundred forty million, four hundred forty-seven thousand, nine hundred sixty-three".