2644849821 has 8 divisors (see below), whose sum is σ = 3562822144. Its totient is φ = 1745055360.

The previous prime is 2644849819. The next prime is 2644849829. The reversal of 2644849821 is 1289484462.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 2644849821 - 2¹ = 2644849819 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 (2644849829) 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 7 ways as a sum of consecutive naturals, for example, 4544125 + ... + 4544706.

It is an arithmetic number, because the mean of its divisors is an integer number (445352768).

Almost surely, 2^2644849821 is an apocalyptic number.

It is an amenable number.

2644849821 is a deficient number, since it is larger than the sum of its proper divisors (917972323).

2644849821 is an equidigital number, since it uses as much as digits as its factorization.

2644849821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9088931.

The product of its digits is 884736, while the sum is 48.

The square root of 2644849821 is about 51428.1034163229. The cubic root of 2644849821 is about 1382.9304493883.

The spelling of 2644849821 in words is "two billion, six hundred forty-four million, eight hundred forty-nine thousand, eight hundred twenty-one".