2780749971 has 12 divisors (see below), whose sum is σ = 4102099872. Its totient is φ = 1814389776.

The previous prime is 2780749897. The next prime is 2780749973. The reversal of 2780749971 is 1799470872.

2780749971 is a `hidden beast` number, since 2 + 7 + 80 + 7 + 499 + 71 = 666.

It is not a de Polignac number, because 2780749971 - 2¹¹ = 2780747923 is a prime.

It is not an unprimeable number, because it can be changed into a prime (2780749973) 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 11 ways as a sum of consecutive naturals, for example, 3286516 + ... + 3287361.

It is an arithmetic number, because the mean of its divisors is an integer number (341841656).

Almost surely, 2^2780749971 is an apocalyptic number.

2780749971 is a deficient number, since it is larger than the sum of its proper divisors (1321349901).

2780749971 is a wasteful number, since it uses less digits than its factorization.

2780749971 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6573930 (or 6573927 counting only the distinct ones).

The product of its (nonzero) digits is 1778112, while the sum is 54.

The square root of 2780749971 is about 52732.8168316467. The cubic root of 2780749971 is about 1406.2222990929. Note that the first 4 decimals are identical.

The spelling of 2780749971 in words is "two billion, seven hundred eighty million, seven hundred forty-nine thousand, nine hundred seventy-one".