6730643621 has 8 divisors (see below), whose sum is σ = 7674761304. Its totient is φ = 5847436800.

The previous prime is 6730643609. The next prime is 6730643627. The reversal of 6730643621 is 1263460376.

It can be written as a sum of positive squares in 4 ways, for example, as 300849025 + 6429794596 = 17345^2 + 80186^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6730643621 - 2¹⁸ = 6730381477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6730643627) 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, 15227480 + ... + 15227921.

It is an arithmetic number, because the mean of its divisors is an integer number (959345163).

Almost surely, 2^6730643621 is an apocalyptic number.

It is an amenable number.

6730643621 is a deficient number, since it is larger than the sum of its proper divisors (944117683).

6730643621 is a wasteful number, since it uses less digits than its factorization.

6730643621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30455431.

The product of its (nonzero) digits is 108864, while the sum is 38.

The square root of 6730643621 is about 82040.4998826799. The cubic root of 6730643621 is about 1888.0733631488.

The spelling of 6730643621 in words is "six billion, seven hundred thirty million, six hundred forty-three thousand, six hundred twenty-one".