6447641 has 4 divisors (see below), whose sum is σ = 6826932. Its totient is φ = 6068352.

The previous prime is 6447629. The next prime is 6447643. The reversal of 6447641 is 1467446.

6447641 = 1795² + 1796².

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 3222025 + 3225616 = 1795^2 + 1796^2 .

It is a cyclic number.

It is not a de Polignac number, because 6447641 - 2⁶ = 6447577 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 6447598 and 6447607.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6447643) 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, 189620 + ... + 189653.

It is an arithmetic number, because the mean of its divisors is an integer number (1706733).

Almost surely, 2^6447641 is an apocalyptic number.

6447641 is the 1796-th centered square number.

It is an amenable number.

6447641 is a deficient number, since it is larger than the sum of its proper divisors (379291).

6447641 is a wasteful number, since it uses less digits than its factorization.

6447641 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379290.

The product of its digits is 16128, while the sum is 32.

The square root of 6447641 is about 2539.2205496963. The cubic root of 6447641 is about 186.1231023057.

The spelling of 6447641 in words is "six million, four hundred forty-seven thousand, six hundred forty-one".