8447647994 has 32 divisors (see below), whose sum is σ = 13208832000. Its totient is φ = 4047545520.

The previous prime is 8447647993. The next prime is 8447647997. The reversal of 8447647994 is 4997467448.

It is a Harshad number since it is a multiple of its sum of digits (62).

It is not an unprimeable number, because it can be changed into a prime (8447647991) 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 15 ways as a sum of consecutive naturals, for example, 4023557 + ... + 4025655.

It is an arithmetic number, because the mean of its divisors is an integer number (412776000).

Almost surely, 2^8447647994 is an apocalyptic number.

8447647994 is a deficient number, since it is larger than the sum of its proper divisors (4761184006).

8447647994 is a wasteful number, since it uses less digits than its factorization.

8447647994 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2738.

The product of its digits is 48771072, while the sum is 62.

The square root of 8447647994 is about 91911.0874378059. The cubic root of 8447647994 is about 2036.6290600811.

The spelling of 8447647994 in words is "eight billion, four hundred forty-seven million, six hundred forty-seven thousand, nine hundred ninety-four".