2781642005 has 16 divisors (see below), whose sum is σ = 3405318384. Its totient is φ = 2180805120.

The previous prime is 2781642001. The next prime is 2781642043. The reversal of 2781642005 is 5002461872.

It can be written as a sum of positive squares in 8 ways, for example, as 582594769 + 2199047236 = 24137^2 + 46894^2 .

It is not a de Polignac number, because 2781642005 - 2² = 2781642001 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 (2781642001) 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 15 ways as a sum of consecutive naturals, for example, 33035 + ... + 81575.

It is an arithmetic number, because the mean of its divisors is an integer number (212832399).

Almost surely, 2^2781642005 is an apocalyptic number.

It is an amenable number.

2781642005 is a deficient number, since it is larger than the sum of its proper divisors (623676379).

2781642005 is a wasteful number, since it uses less digits than its factorization.

2781642005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48776.

The product of its (nonzero) digits is 26880, while the sum is 35.

The square root of 2781642005 is about 52741.2742072089. The cubic root of 2781642005 is about 1406.3726498983.

The spelling of 2781642005 in words is "two billion, seven hundred eighty-one million, six hundred forty-two thousand, five".