6673621 has 4 divisors (see below), whose sum is σ = 6698700. Its totient is φ = 6648544.

The previous prime is 6673613. The next prime is 6673627. The reversal of 6673621 is 1263766.

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 3010225 + 3663396 = 1735^2 + 1914^2 .

It is a cyclic number.

It is not a de Polignac number, because 6673621 - 2³ = 6673613 is a prime.

It is an Ulam number.

It is a Duffinian number.

6673621 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6673627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12136 + ... + 12673.

It is an arithmetic number, because the mean of its divisors is an integer number (1674675).

Almost surely, 2^6673621 is an apocalyptic number.

It is an amenable number.

6673621 is a deficient number, since it is larger than the sum of its proper divisors (25079).

6673621 is a wasteful number, since it uses less digits than its factorization.

6673621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25078.

The product of its digits is 9072, while the sum is 31.

The square root of 6673621 is about 2583.3352473111. The cubic root of 6673621 is about 188.2726258161.

The spelling of 6673621 in words is "six million, six hundred seventy-three thousand, six hundred twenty-one".