2820867849 has 20 divisors (see below), whose sum is σ = 4218093396. Its totient is φ = 1878702336.

The previous prime is 2820867839. The next prime is 2820867911. The reversal of 2820867849 is 9487680282.

It can be written as a sum of positive squares in 2 ways, for example, as 1680590025 + 1140277824 = 40995^2 + 33768^2 .

It is not a de Polignac number, because 2820867849 - 2¹² = 2820863753 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2820867795 and 2820867804.

It is not an unprimeable number, because it can be changed into a prime (2820867809) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 66817 + ... + 100529.

Almost surely, 2^2820867849 is an apocalyptic number.

It is an amenable number.

2820867849 is a deficient number, since it is larger than the sum of its proper divisors (1397225547).

2820867849 is a wasteful number, since it uses less digits than its factorization.

2820867849 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34758 (or 34749 counting only the distinct ones).

The product of its (nonzero) digits is 3096576, while the sum is 54.

The square root of 2820867849 is about 53111.8428318958. The cubic root of 2820867849 is about 1412.9525590249.

The spelling of 2820867849 in words is "two billion, eight hundred twenty million, eight hundred sixty-seven thousand, eight hundred forty-nine".