648806 has 4 divisors (see below), whose sum is σ = 973212. Its totient is φ = 324402.

The previous prime is 648803. The next prime is 648841. The reversal of 648806 is 608846.

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

It is an Ulam number.

It is a congruent number.

It is an inconsummate number, since it does not exist a number n which divided by its sum of digits gives 648806.

It is not an unprimeable number, because it can be changed into a prime (648803) 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 as a sum of consecutive naturals, namely, 162200 + ... + 162203.

It is an arithmetic number, because the mean of its divisors is an integer number (243303).

2⁶⁴⁸⁸⁰⁶ is an apocalyptic number.

648806 is a deficient number, since it is larger than the sum of its proper divisors (324406).

648806 is a wasteful number, since it uses less digits than its factorization.

648806 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 324405.

The product of its (nonzero) digits is 9216, while the sum is 32.

The square root of 648806 is about 805.4849470971. The cubic root of 648806 is about 86.5708375371.

The spelling of 648806 in words is "six hundred forty-eight thousand, eight hundred six".