6721473648 has 20 divisors (see below), whose sum is σ = 17363807048. Its totient is φ = 2240491200.

The previous prime is 6721473643. The next prime is 6721473659. The reversal of 6721473648 is 8463741276.

It is a happy number.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 140030701 = 6721473648 / (6 + 7 + 2 + 1 + 4 + 7 + 3 + 6 + 4 + 8).

It is a junction number, because it is equal to n+sod(n) for n = 6721473597 and 6721473606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6721473643) 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, 70015303 + ... + 70015398.

Almost surely, 2^6721473648 is an apocalyptic number.

It is an amenable number.

6721473648 is an abundant number, since it is smaller than the sum of its proper divisors (10642333400).

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

6721473648 is a wasteful number, since it uses less digits than its factorization.

6721473648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 140030712 (or 140030706 counting only the distinct ones).

The product of its digits is 1354752, while the sum is 48.

The square root of 6721473648 is about 81984.5939674034. The cubic root of 6721473648 is about 1887.2155229236.

The spelling of 6721473648 in words is "six billion, seven hundred twenty-one million, four hundred seventy-three thousand, six hundred forty-eight".