6464921444 has 6 divisors (see below), whose sum is σ = 11313612534. Its totient is φ = 3232460720.

The previous prime is 6464921431. The next prime is 6464921453. The reversal of 6464921444 is 4441294646.

It can be written as a sum of positive squares in only one way, i.e., 6127758400 + 337163044 = 78280^2 + 18362^2 .

It is a junction number, because it is equal to n+sod(n) for n = 6464921395 and 6464921404.

It is an unprimeable number.

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 as a sum of consecutive naturals, namely, 808115177 + ... + 808115184.

It is an arithmetic number, because the mean of its divisors is an integer number (1885602089).

Almost surely, 2^6464921444 is an apocalyptic number.

It is an amenable number.

6464921444 is a deficient number, since it is larger than the sum of its proper divisors (4848691090).

6464921444 is a wasteful number, since it uses less digits than its factorization.

6464921444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1616230365 (or 1616230363 counting only the distinct ones).

The product of its digits is 663552, while the sum is 44.

The square root of 6464921444 is about 80404.7352088171. The cubic root of 6464921444 is about 1862.8923132202.

The spelling of 6464921444 in words is "six billion, four hundred sixty-four million, nine hundred twenty-one thousand, four hundred forty-four".