648787 has 4 divisors (see below), whose sum is σ = 650440. Its totient is φ = 647136.

The previous prime is 648779. The next prime is 648803. The reversal of 648787 is 787846.

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 648787 - 2³ = 648779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (648887) 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 3 ways as a sum of consecutive naturals, for example, 139 + ... + 1147.

It is an arithmetic number, because the mean of its divisors is an integer number (162610).

2⁶⁴⁸⁷⁸⁷ is an apocalyptic number.

648787 is a deficient number, since it is larger than the sum of its proper divisors (1653).

648787 is a wasteful number, since it uses less digits than its factorization.

648787 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1652.

The product of its digits is 75264, while the sum is 40.

The square root of 648787 is about 805.4731528735. The cubic root of 648787 is about 86.5699924658.

The spelling of 648787 in words is "six hundred forty-eight thousand, seven hundred eighty-seven".