6398974664 has 32 divisors (see below), whose sum is σ = 12202548600. Its totient is φ = 3145029120.

The previous prime is 6398974661. The next prime is 6398974669. The reversal of 6398974664 is 4664798936.

It can be written as a sum of positive squares in 4 ways, for example, as 6234365764 + 164608900 = 78958^2 + 12830^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6398974597 and 6398974606.

It is not an unprimeable number, because it can be changed into a prime (6398974661) 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 7 ways as a sum of consecutive naturals, for example, 1016294 + ... + 1022570.

Almost surely, 2^6398974664 is an apocalyptic number.

It is an amenable number.

6398974664 is a deficient number, since it is larger than the sum of its proper divisors (5803573936).

6398974664 is a wasteful number, since it uses less digits than its factorization.

6398974664 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8433 (or 8429 counting only the distinct ones).

The product of its digits is 47029248, while the sum is 62.

The square root of 6398974664 is about 79993.5913933110. The cubic root of 6398974664 is about 1856.5363783971.

The spelling of 6398974664 in words is "six billion, three hundred ninety-eight million, nine hundred seventy-four thousand, six hundred sixty-four".