2791778949 has 12 divisors (see below), whose sum is σ = 4033237312. Its totient is φ = 1860877800.

The previous prime is 2791778923. The next prime is 2791778963. The reversal of 2791778949 is 9498771972.

It is not a de Polignac number, because 2791778949 - 2⁵ = 2791778917 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 (2791778849) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 40734 + ... + 85104.

Almost surely, 2^2791778949 is an apocalyptic number.

It is an amenable number.

2791778949 is a deficient number, since it is larger than the sum of its proper divisors (1241458363).

2791778949 is a wasteful number, since it uses less digits than its factorization.

2791778949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 51368 (or 51365 counting only the distinct ones).

The product of its digits is 16003008, while the sum is 63.

The square root of 2791778949 is about 52837.2874871525. The cubic root of 2791778949 is about 1408.0789607720.

The spelling of 2791778949 in words is "two billion, seven hundred ninety-one million, seven hundred seventy-eight thousand, nine hundred forty-nine".