6445623 has 8 divisors (see below), whose sum is σ = 8607088. Its totient is φ = 4290624.

The previous prime is 6445619. The next prime is 6445639. The reversal of 6445623 is 3265446.

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

It is not a de Polignac number, because 6445623 - 2² = 6445619 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6445223) 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, 1665 + ... + 3957.

It is an arithmetic number, because the mean of its divisors is an integer number (1075886).

Almost surely, 2^6445623 is an apocalyptic number.

6445623 is a deficient number, since it is larger than the sum of its proper divisors (2161465).

6445623 is a wasteful number, since it uses less digits than its factorization.

6445623 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3233.

The product of its digits is 17280, while the sum is 30.

The square root of 6445623 is about 2538.8231525650. The cubic root of 6445623 is about 186.1036825100.

The spelling of 6445623 in words is "six million, four hundred forty-five thousand, six hundred twenty-three".