2820648449 has 4 divisors (see below), whose sum is σ = 2986568964. Its totient is φ = 2654727936.

The previous prime is 2820648443. The next prime is 2820648451. The reversal of 2820648449 is 9448460282.

It is a happy number.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2344012225 + 476636224 = 48415^2 + 21832^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2820648449 is a prime.

It is a super-2 number, since 2×2820648449² = 15912115345692211202, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2820648443) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82960232 + ... + 82960265.

It is an arithmetic number, because the mean of its divisors is an integer number (746642241).

Almost surely, 2^2820648449 is an apocalyptic number.

It is an amenable number.

2820648449 is a deficient number, since it is larger than the sum of its proper divisors (165920515).

2820648449 is a wasteful number, since it uses less digits than its factorization.

2820648449 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 165920514.

The product of its (nonzero) digits is 884736, while the sum is 47.

The square root of 2820648449 is about 53109.7773390173. Note that the first 3 decimals coincide. The cubic root of 2820648449 is about 1412.9159261108.

The spelling of 2820648449 in words is "two billion, eight hundred twenty million, six hundred forty-eight thousand, four hundred forty-nine".