6398121648 has 40 divisors (see below), whose sum is σ = 16541463600. Its totient is φ = 2131032064.

The previous prime is 6398121647. The next prime is 6398121671. The reversal of 6398121648 is 8461218936.

It is a Smith number, since the sum of its digits (48) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (48).

It is a junction number, because it is equal to n+sod(n) for n = 6398121597 and 6398121606.

It is not an unprimeable number, because it can be changed into a prime (6398121643) 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 7 ways as a sum of consecutive naturals, for example, 10168 + ... + 113576.

It is an arithmetic number, because the mean of its divisors is an integer number (413536590).

Almost surely, 2^6398121648 is an apocalyptic number.

It is an amenable number.

6398121648 is an abundant number, since it is smaller than the sum of its proper divisors (10143341952).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6398121648 is a wasteful number, since it uses less digits than its factorization.

6398121648 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 104709 (or 104703 counting only the distinct ones).

The product of its digits is 497664, while the sum is 48.

The square root of 6398121648 is about 79988.2594384951. The cubic root of 6398121648 is about 1856.4538794712.

The spelling of 6398121648 in words is "six billion, three hundred ninety-eight million, one hundred twenty-one thousand, six hundred forty-eight".