2781343693 has 8 divisors (see below), whose sum is σ = 2816904888. Its totient is φ = 2745974784.

The previous prime is 2781343679. The next prime is 2781343703. The reversal of 2781343693 is 3963431872.

It can be written as a sum of positive squares in 4 ways, for example, as 287539849 + 2493803844 = 16957^2 + 49938^2 .

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 2781343693 - 2⁹ = 2781343181 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2781343493) 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, 18846 + ... + 76927.

It is an arithmetic number, because the mean of its divisors is an integer number (352113111).

Almost surely, 2^2781343693 is an apocalyptic number.

It is an amenable number.

2781343693 is a deficient number, since it is larger than the sum of its proper divisors (35561195).

2781343693 is a wasteful number, since it uses less digits than its factorization.

2781343693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 96143.

The product of its digits is 653184, while the sum is 46.

The square root of 2781343693 is about 52738.4460616731. The cubic root of 2781343693 is about 1406.3223734986.

The spelling of 2781343693 in words is "two billion, seven hundred eighty-one million, three hundred forty-three thousand, six hundred ninety-three".