6628591 has 4 divisors (see below), whose sum is σ = 6741000. Its totient is φ = 6516184.

The previous prime is 6628571. The next prime is 6628607. The reversal of 6628591 is 1958266.

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

It is a cyclic number.

It is not a de Polignac number, because 6628591 - 2¹³ = 6620399 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 6628591.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6628541) 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, 56116 + ... + 56233.

It is an arithmetic number, because the mean of its divisors is an integer number (1685250).

Almost surely, 2^6628591 is an apocalyptic number.

6628591 is a deficient number, since it is larger than the sum of its proper divisors (112409).

6628591 is a wasteful number, since it uses less digits than its factorization.

6628591 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 112408.

The product of its digits is 25920, while the sum is 37.

The square root of 6628591 is about 2574.6050182504. The cubic root of 6628591 is about 187.8482157255.

The spelling of 6628591 in words is "six million, six hundred twenty-eight thousand, five hundred ninety-one".