6427621 has 6 divisors (see below), whose sum is σ = 6499122. Its totient is φ = 6356880.

The previous prime is 6427613. The next prime is 6427639. The reversal of 6427621 is 1267246.

It can be written as a sum of positive squares in 3 ways, for example, as 1718721 + 4708900 = 1311^2 + 2170^2 .

It is not a de Polignac number, because 6427621 - 2³ = 6427613 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 6427621.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6427651) 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 5 ways as a sum of consecutive naturals, for example, 11611 + ... + 12151.

It is an arithmetic number, because the mean of its divisors is an integer number (1083187).

Almost surely, 2^6427621 is an apocalyptic number.

It is an amenable number.

6427621 is a deficient number, since it is larger than the sum of its proper divisors (71501).

6427621 is an equidigital number, since it uses as much as digits as its factorization.

6427621 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 759 (or 650 counting only the distinct ones).

The product of its digits is 4032, while the sum is 28.

The square root of 6427621 is about 2535.2753302156. The cubic root of 6427621 is about 185.9302644502.

The spelling of 6427621 in words is "six million, four hundred twenty-seven thousand, six hundred twenty-one".