6781305730 has 8 divisors (see below), whose sum is σ = 12206350332. Its totient is φ = 2712522288.

The previous prime is 6781305719. The next prime is 6781305733. The reversal of 6781305730 is 375031876.

It can be written as a sum of positive squares in 2 ways, for example, as 6632636481 + 148669249 = 81441^2 + 12193^2 .

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

It is a super-2 number, since 2×6781305730² = 91972214807461665800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (6781305733) 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, 339065277 + ... + 339065296.

Almost surely, 2^6781305730 is an apocalyptic number.

6781305730 is a deficient number, since it is larger than the sum of its proper divisors (5425044602).

6781305730 is a wasteful number, since it uses less digits than its factorization.

6781305730 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 678130580.

The product of its (nonzero) digits is 105840, while the sum is 40.

The square root of 6781305730 is about 82348.6838389054. The cubic root of 6781305730 is about 1892.7987546830.

The spelling of 6781305730 in words is "six billion, seven hundred eighty-one million, three hundred five thousand, seven hundred thirty".