6643746 has 12 divisors (see below), whose sum is σ = 14394822. Its totient is φ = 2214576.

The previous prime is 6643739. The next prime is 6643781. The reversal of 6643746 is 6473466.

6643746 is a `hidden beast` number, since 6 + 643 + 7 + 4 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 5239521 + 1404225 = 2289^2 + 1185^2 .

It is a d-powerful number, because it can be written as 6³ + 6⁶ + 4⁴ + 3¹⁴ + 7⁶ + 4⁷ + 6⁸ .

It is a self number, because there is not a number n which added to its sum of digits gives 6643746.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 184531 + ... + 184566.

Almost surely, 2^6643746 is an apocalyptic number.

6643746 is an abundant number, since it is smaller than the sum of its proper divisors (7751076).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6643746 is a wasteful number, since it uses less digits than its factorization.

6643746 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 369105 (or 369102 counting only the distinct ones).

The product of its digits is 72576, while the sum is 36.

The square root of 6643746 is about 2577.5465078248. The cubic root of 6643746 is about 187.9912663817.

The spelling of 6643746 in words is "six million, six hundred forty-three thousand, seven hundred forty-six".