6671621 has 8 divisors (see below), whose sum is σ = 7297344. Its totient is φ = 6049120.

The previous prime is 6671617. The next prime is 6671627. The reversal of 6671621 is 1261766.

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

It is not a de Polignac number, because 6671621 - 2² = 6671617 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6671627) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 6296 + ... + 7278.

It is an arithmetic number, because the mean of its divisors is an integer number (912168).

Almost surely, 2^6671621 is an apocalyptic number.

It is an amenable number.

6671621 is a deficient number, since it is larger than the sum of its proper divisors (625723).

6671621 is a wasteful number, since it uses less digits than its factorization.

6671621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1611.

The product of its digits is 3024, while the sum is 29.

The square root of 6671621 is about 2582.9481218174. The cubic root of 6671621 is about 188.2538162936.

The spelling of 6671621 in words is "six million, six hundred seventy-one thousand, six hundred twenty-one".