6445444776 has 16 divisors (see below), whose sum is σ = 16113612000. Its totient is φ = 2148481584.

The previous prime is 6445444771. The next prime is 6445444783. The reversal of 6445444776 is 6774445446.

It is a hoax number, since the sum of its digits (51) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (6445444771) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 134280076 + ... + 134280123.

It is an arithmetic number, because the mean of its divisors is an integer number (1007100750).

Almost surely, 2^6445444776 is an apocalyptic number.

It is an amenable number.

6445444776 is an abundant number, since it is smaller than the sum of its proper divisors (9668167224).

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

6445444776 is a wasteful number, since it uses less digits than its factorization.

6445444776 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 268560208 (or 268560204 counting only the distinct ones).

The product of its digits is 9031680, while the sum is 51.

The square root of 6445444776 is about 80283.5274262411. The cubic root of 6445444776 is about 1861.0196721431.

The spelling of 6445444776 in words is "six billion, four hundred forty-five million, four hundred forty-four thousand, seven hundred seventy-six".