6643634 has 8 divisors (see below), whose sum is σ = 10551708. Its totient is φ = 3126400.

The previous prime is 6643633. The next prime is 6643649. The reversal of 6643634 is 4363466.

It can be written as a sum of positive squares in 2 ways, for example, as 6225025 + 418609 = 2495^2 + 647^2 .

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

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 6643634.

It is not an unprimeable number, because it can be changed into a prime (6643633) 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, 97667 + ... + 97734.

Almost surely, 2^6643634 is an apocalyptic number.

6643634 is a deficient number, since it is larger than the sum of its proper divisors (3908074).

6643634 is a wasteful number, since it uses less digits than its factorization.

6643634 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 195420.

The product of its digits is 31104, while the sum is 32.

The square root of 6643634 is about 2577.5247816461. The cubic root of 6643634 is about 187.9902099927.

The spelling of 6643634 in words is "six million, six hundred forty-three thousand, six hundred thirty-four".