2781294065 has 32 divisors (see below), whose sum is σ = 3713478912. Its totient is φ = 1982880000.

The previous prime is 2781294049. The next prime is 2781294071. The reversal of 2781294065 is 5604921872.

It is a happy number.

It is not a de Polignac number, because 2781294065 - 2⁴ = 2781294049 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 569735 + ... + 574595.

It is an arithmetic number, because the mean of its divisors is an integer number (116046216).

Almost surely, 2^2781294065 is an apocalyptic number.

It is an amenable number.

2781294065 is a deficient number, since it is larger than the sum of its proper divisors (932184847).

2781294065 is a wasteful number, since it uses less digits than its factorization.

2781294065 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5081.

The product of its (nonzero) digits is 241920, while the sum is 44.

The square root of 2781294065 is about 52737.9755489344. The cubic root of 2781294065 is about 1406.3140090305.

The spelling of 2781294065 in words is "two billion, seven hundred eighty-one million, two hundred ninety-four thousand, sixty-five".