5665649 has 8 divisors (see below), whose sum is σ = 6199200. Its totient is φ = 5135200.

The previous prime is 5665631. The next prime is 5665661. The reversal of 5665649 is 9465665.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 5665649 - 2¹⁶ = 5600113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (5665609) 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 7 ways as a sum of consecutive naturals, for example, 4877 + ... + 5925.

It is an arithmetic number, because the mean of its divisors is an integer number (774900).

Almost surely, 2^5665649 is an apocalyptic number.

It is an amenable number.

5665649 is a deficient number, since it is larger than the sum of its proper divisors (533551).

5665649 is a wasteful number, since it uses less digits than its factorization.

5665649 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1551.

The product of its digits is 194400, while the sum is 41.

The square root of 5665649 is about 2380.2623804951. The cubic root of 5665649 is about 178.2720349101.

The spelling of 5665649 in words is "five million, six hundred sixty-five thousand, six hundred forty-nine".