6216638 has 4 divisors (see below), whose sum is σ = 9324960. Its totient is φ = 3108318.

The previous prime is 6216599. The next prime is 6216697. The reversal of 6216638 is 8366126.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8366126 = 2 ⋅4183063.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1554158 + ... + 1554161.

It is an arithmetic number, because the mean of its divisors is an integer number (2331240).

Almost surely, 2^6216638 is an apocalyptic number.

6216638 is a deficient number, since it is larger than the sum of its proper divisors (3108322).

6216638 is a wasteful number, since it uses less digits than its factorization.

6216638 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3108321.

The product of its digits is 10368, while the sum is 32.

The square root of 6216638 is about 2493.3186719712. The cubic root of 6216638 is about 183.8732389365.

The spelling of 6216638 in words is "six million, two hundred sixteen thousand, six hundred thirty-eight".