6491820844 has 12 divisors (see below), whose sum is σ = 11373856704. Its totient is φ = 3242147504.

The previous prime is 6491820827. The next prime is 6491820851. The reversal of 6491820844 is 4480281946.

It is a junction number, because it is equal to n+sod(n) for n = 6491820794 and 6491820803.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 936847 + ... + 943750.

It is an arithmetic number, because the mean of its divisors is an integer number (947821392).

Almost surely, 2^6491820844 is an apocalyptic number.

It is an amenable number.

6491820844 is a deficient number, since it is larger than the sum of its proper divisors (4882035860).

6491820844 is a wasteful number, since it uses less digits than its factorization.

6491820844 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1881464 (or 1881462 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 46.

The square root of 6491820844 is about 80571.8365435467. The cubic root of 6491820844 is about 1865.4724603292.

The spelling of 6491820844 in words is "six billion, four hundred ninety-one million, eight hundred twenty thousand, eight hundred forty-four".