6445779 has 8 divisors (see below), whose sum is σ = 8606352. Its totient is φ = 4291200.

The previous prime is 6445757. The next prime is 6445793. The reversal of 6445779 is 9775446.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a de Polignac number, because none of the positive numbers 2^k-6445779 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 6445779.

It is not an unprimeable number, because it can be changed into a prime (6445729) 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, 2679 + ... + 4479.

It is an arithmetic number, because the mean of its divisors is an integer number (1075794).

Almost surely, 2^6445779 is an apocalyptic number.

6445779 is a deficient number, since it is larger than the sum of its proper divisors (2160573).

6445779 is a wasteful number, since it uses less digits than its factorization.

6445779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2997.

The product of its digits is 211680, while the sum is 42.

The square root of 6445779 is about 2538.8538752752. The cubic root of 6445779 is about 186.1051838875.

The spelling of 6445779 in words is "six million, four hundred forty-five thousand, seven hundred seventy-nine".