6445679628 has 24 divisors (see below), whose sum is σ = 15129983232. Its totient is φ = 2135693584.

The previous prime is 6445679627. The next prime is 6445679629. The reversal of 6445679628 is 8269765446.

It is an interprime number because it is at equal distance from previous prime (6445679627) and next prime (6445679629).

It is not an unprimeable number, because it can be changed into a prime (6445679627) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1606200 + ... + 1610207.

It is an arithmetic number, because the mean of its divisors is an integer number (630415968).

Almost surely, 2^6445679628 is an apocalyptic number.

It is an amenable number.

6445679628 is an abundant number, since it is smaller than the sum of its proper divisors (8684303604).

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

6445679628 is a wasteful number, since it uses less digits than its factorization.

6445679628 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3216581 (or 3216579 counting only the distinct ones).

The product of its digits is 17418240, while the sum is 57.

The square root of 6445679628 is about 80284.9900541814. The cubic root of 6445679628 is about 1861.0422751286.

The spelling of 6445679628 in words is "six billion, four hundred forty-five million, six hundred seventy-nine thousand, six hundred twenty-eight".