648667 has 4 divisors (see below), whose sum is σ = 660960. Its totient is φ = 636376.

The previous prime is 648653. The next prime is 648671. The reversal of 648667 is 766846.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 648667 - 2¹¹ = 646619 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648607) 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 3 ways as a sum of consecutive naturals, for example, 6067 + ... + 6172.

It is an arithmetic number, because the mean of its divisors is an integer number (165240).

2⁶⁴⁸⁶⁶⁷ is an apocalyptic number.

648667 is a deficient number, since it is larger than the sum of its proper divisors (12293).

648667 is a wasteful number, since it uses less digits than its factorization.

648667 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12292.

The product of its digits is 48384, while the sum is 37.

The square root of 648667 is about 805.3986590503. The cubic root of 648667 is about 86.5646547922.

The spelling of 648667 in words is "six hundred forty-eight thousand, six hundred sixty-seven".