5668649 has 16 divisors (see below), whose sum is σ = 6835968. Its totient is φ = 4595712.

The previous prime is 5668639. The next prime is 5668673. The reversal of 5668649 is 9468665.

5668649 = T₂ + T₃ + ... + T₃₂₃.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-5668649 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (5668609) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21929 + ... + 22185.

It is an arithmetic number, because the mean of its divisors is an integer number (427248).

Almost surely, 2^5668649 is an apocalyptic number.

It is an amenable number.

5668649 is a deficient number, since it is larger than the sum of its proper divisors (1167319).

5668649 is a wasteful number, since it uses less digits than its factorization.

5668649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 424.

The product of its digits is 311040, while the sum is 44.

The square root of 5668649 is about 2380.8924797227. The cubic root of 5668649 is about 178.3034947797.

The spelling of 5668649 in words is "five million, six hundred sixty-eight thousand, six hundred forty-nine".