6420444444 has 36 divisors (see below), whose sum is σ = 16789095960. Its totient is φ = 2066349600.

The previous prime is 6420444431. The next prime is 6420444469. The reversal of 6420444444 is 4444440246.

6420444444 is a `hidden beast` number, since 6 + 4 + 204 + 4 + 4 + 444 = 666.

It is a tau number, because it is divible by the number of its divisors (36).

It is a Harshad number since it is a multiple of its sum of digits (36).

6420444444 is a modest number, since divided by 444444 gives 6420 as remainder.

It is a junction number, because it is equal to n+sod(n) for n = 6420444399 and 6420444408.

It is a congruent number.

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 in 11 ways as a sum of consecutive naturals, for example, 3073882 + ... + 3075969.

Almost surely, 2^6420444444 is an apocalyptic number.

It is an amenable number.

6420444444 is an abundant number, since it is smaller than the sum of its proper divisors (10368651516).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6420444444 is a wasteful number, since it uses less digits than its factorization.

6420444444 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6149890 (or 6149885 counting only the distinct ones).

The product of its (nonzero) digits is 196608, while the sum is 36.

The square root of 6420444444 is about 80127.6758929148. The cubic root of 6420444444 is about 1858.6104050418.

The spelling of 6420444444 in words is "six billion, four hundred twenty million, four hundred forty-four thousand, four hundred forty-four".