6635945 has 8 divisors (see below), whose sum is σ = 8004744. Its totient is φ = 5281024.

The previous prime is 6635927. The next prime is 6635947. The reversal of 6635945 is 5495366.

It can be written as a sum of positive squares in 4 ways, for example, as 2421136 + 4214809 = 1556^2 + 2053^2 .

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 6635945 - 2⁸ = 6635689 is a prime.

It is an Ulam number.

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 = 6635899 and 6635908.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6635947) 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, 2384 + ... + 4353.

It is an arithmetic number, because the mean of its divisors is an integer number (1000593).

Almost surely, 2^6635945 is an apocalyptic number.

It is an amenable number.

6635945 is a deficient number, since it is larger than the sum of its proper divisors (1368799).

6635945 is a wasteful number, since it uses less digits than its factorization.

6635945 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6939.

The product of its digits is 97200, while the sum is 38.

The square root of 6635945 is about 2576.0328025862. The cubic root of 6635945 is about 187.9176585991.

The spelling of 6635945 in words is "six million, six hundred thirty-five thousand, nine hundred forty-five".