6642445 has 8 divisors (see below), whose sum is σ = 8029944. Its totient is φ = 5274624.

The previous prime is 6642439. The next prime is 6642487. The reversal of 6642445 is 5442466.

It can be written as a sum of positive squares in 4 ways, for example, as 155236 + 6487209 = 394^2 + 2547^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 6642445 - 2¹¹ = 6640397 is a prime.

It is a d-powerful number, because it can be written as 6⁴ + 6⁷ + 4⁶ + 2²¹ + 4⁸ + 4¹¹ + 5³ .

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4164 + ... + 5533.

It is an arithmetic number, because the mean of its divisors is an integer number (1003743).

Almost surely, 2^6642445 is an apocalyptic number.

It is an amenable number.

6642445 is a deficient number, since it is larger than the sum of its proper divisors (1387499).

6642445 is a wasteful number, since it uses less digits than its factorization.

6642445 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9839.

The product of its digits is 23040, while the sum is 31.

The square root of 6642445 is about 2577.2941236886. The cubic root of 6642445 is about 187.9789945597.

The spelling of 6642445 in words is "six million, six hundred forty-two thousand, four hundred forty-five".