6780001905 has 24 divisors (see below), whose sum is σ = 11837795112. Its totient is φ = 3589603584.

The previous prime is 6780001903. The next prime is 6780001913. The reversal of 6780001905 is 5091000876.

It can be written as a sum of positive squares in 4 ways, for example, as 1937664 + 6778064241 = 1392^2 + 82329^2 .

It is not a de Polignac number, because 6780001905 - 2¹ = 6780001903 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6780001905.

It is not an unprimeable number, because it can be changed into a prime (6780001903) 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 23 ways as a sum of consecutive naturals, for example, 543714 + ... + 556043.

It is an arithmetic number, because the mean of its divisors is an integer number (493241463).

Almost surely, 2^6780001905 is an apocalyptic number.

It is an amenable number.

6780001905 is a deficient number, since it is larger than the sum of its proper divisors (5057793207).

6780001905 is a wasteful number, since it uses less digits than its factorization.

6780001905 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1099905 (or 1099902 counting only the distinct ones).

The product of its (nonzero) digits is 15120, while the sum is 36.

The square root of 6780001905 is about 82340.7669687379. The cubic root of 6780001905 is about 1892.6774389849.

The spelling of 6780001905 in words is "six billion, seven hundred eighty million, one thousand, nine hundred five".