5668639 has 2 divisors, whose sum is σ = 5668640. Its totient is φ = 5668638.

The previous prime is 5668627. The next prime is 5668673. The reversal of 5668639 is 9368665.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5668639 - 2¹⁵ = 5635871 is a prime.

It is a super-2 number, since 2×5668639² = 64266936224642, which contains 22 as substring.

5668639 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 5668595 and 5668604.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5668609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2834319 + 2834320.

It is an arithmetic number, because the mean of its divisors is an integer number (2834320).

Almost surely, 2^5668639 is an apocalyptic number.

5668639 is a deficient number, since it is larger than the sum of its proper divisors (1).

5668639 is an equidigital number, since it uses as much as digits as its factorization.

5668639 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 5668639 is about 2380.8903796689. The cubic root of 5668639 is about 178.3033899319.

The spelling of 5668639 in words is "five million, six hundred sixty-eight thousand, six hundred thirty-nine".