6445738944 has 70 divisors (see below), whose sum is σ = 19107204864. Its totient is φ = 2148577920.

The previous prime is 6445738903. The next prime is 6445739009. The reversal of 6445738944 is 4498375446.

6445738944 is a `hidden beast` number, since 64 + 4 + 573 + 8 + 9 + 4 + 4 = 666.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 616512 + ... + 626879.

Almost surely, 2^6445738944 is an apocalyptic number.

6445738944 is a gapful number since it is divisible by the number (64) formed by its first and last digit.

It is an amenable number.

6445738944 is an abundant number, since it is smaller than the sum of its proper divisors (12661465920).

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

6445738944 is a wasteful number, since it uses less digits than its factorization.

6445738944 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1243415 (or 1243396 counting only the distinct ones).

The product of its digits is 11612160, while the sum is 54.

The square root of 6445738944 is about 80285.3594623578. The cubic root of 6445738944 is about 1861.0479838230.

The spelling of 6445738944 in words is "six billion, four hundred forty-five million, seven hundred thirty-eight thousand, nine hundred forty-four".