6628647 has 4 divisors (see below), whose sum is σ = 8838200. Its totient is φ = 4419096.

The previous prime is 6628639. The next prime is 6628651. The reversal of 6628647 is 7468266.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 6628647 - 2³ = 6628639 is a prime.

It is a super-2 number, since 2×6628647² = 87877922101218, which contains 22 as substring.

It is an Ulam number.

It is a d-powerful number, because it can be written as 6 + 6⁶ + 2¹³ + 8⁷ + 6⁷ + 4¹¹ + 7⁴ .

It is a D-number.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6628607) 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 3 ways as a sum of consecutive naturals, for example, 1104772 + ... + 1104777.

It is an arithmetic number, because the mean of its divisors is an integer number (2209550).

Almost surely, 2^6628647 is an apocalyptic number.

6628647 is a deficient number, since it is larger than the sum of its proper divisors (2209553).

6628647 is a wasteful number, since it uses less digits than its factorization.

6628647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2209552.

The product of its digits is 96768, while the sum is 39.

The square root of 6628647 is about 2574.6158936820. The cubic root of 6628647 is about 187.8487447203.

The spelling of 6628647 in words is "six million, six hundred twenty-eight thousand, six hundred forty-seven".