6644873 has 2 divisors, whose sum is σ = 6644874. Its totient is φ = 6644872.

The previous prime is 6644863. The next prime is 6644879. The reversal of 6644873 is 3784466.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3433609 + 3211264 = 1853^2 + 1792^2 .

It is a cyclic number.

It is not a de Polignac number, because 6644873 - 2¹⁶ = 6579337 is a prime.

It is a super-2 number, since 2×6644873² = 88308674372258, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (6644879) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3322436 + 3322437.

It is an arithmetic number, because the mean of its divisors is an integer number (3322437).

Almost surely, 2^6644873 is an apocalyptic number.

It is an amenable number.

6644873 is a deficient number, since it is larger than the sum of its proper divisors (1).

6644873 is an equidigital number, since it uses as much as digits as its factorization.

6644873 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96768, while the sum is 38.

The square root of 6644873 is about 2577.7651173061. The cubic root of 6644873 is about 188.0018956350.

Subtracting from 6644873 its sum of digits (38), we obtain a triangular number (6644835 = T₃₆₄₅).

The spelling of 6644873 in words is "six million, six hundred forty-four thousand, eight hundred seventy-three".