649667 has 8 divisors (see below), whose sum is σ = 706560. Its totient is φ = 595080.

The previous prime is 649661. The next prime is 649697. The reversal of 649667 is 766946.

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

It is not a de Polignac number, because 649667 - 2⁴ = 649651 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 15.

It is a self number, because there is not a number n which added to its sum of digits gives 649667.

It is not an unprimeable number, because it can be changed into a prime (649661) 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 7 ways as a sum of consecutive naturals, for example, 38 + ... + 1140.

It is an arithmetic number, because the mean of its divisors is an integer number (88320).

2⁶⁴⁹⁶⁶⁷ is an apocalyptic number.

649667 is a deficient number, since it is larger than the sum of its proper divisors (56893).

649667 is a wasteful number, since it uses less digits than its factorization.

649667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1153.

The product of its digits is 54432, while the sum is 38.

The square root of 649667 is about 806.0192305398. The cubic root of 649667 is about 86.6091153087.

The spelling of 649667 in words is "six hundred forty-nine thousand, six hundred sixty-seven".