6670621 has 4 divisors (see below), whose sum is σ = 6960672. Its totient is φ = 6380572.

The previous prime is 6670607. The next prime is 6670637. The reversal of 6670621 is 1260766.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 6670621 - 2⁹ = 6670109 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6670621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6670661) 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, 144991 + ... + 145036.

It is an arithmetic number, because the mean of its divisors is an integer number (1740168).

Almost surely, 2^6670621 is an apocalyptic number.

It is an amenable number.

6670621 is a deficient number, since it is larger than the sum of its proper divisors (290051).

6670621 is a wasteful number, since it uses less digits than its factorization.

6670621 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 290050.

The product of its (nonzero) digits is 3024, while the sum is 28.

The square root of 6670621 is about 2582.7545373109. The cubic root of 6670621 is about 188.2444101226.

The spelling of 6670621 in words is "six million, six hundred seventy thousand, six hundred twenty-one".