648857 has 8 divisors (see below), whose sum is σ = 720192. Its totient is φ = 579600.

The previous prime is 648841. The next prime is 648859. The reversal of 648857 is 758846.

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 648857 - 2⁴ = 648841 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 648857.

It is not an unprimeable number, because it can be changed into a prime (648859) 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, 188 + ... + 1154.

It is an arithmetic number, because the mean of its divisors is an integer number (90024).

2⁶⁴⁸⁸⁵⁷ is an apocalyptic number.

It is an amenable number.

648857 is a deficient number, since it is larger than the sum of its proper divisors (71335).

648857 is a wasteful number, since it uses less digits than its factorization.

648857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1039.

The product of its digits is 53760, while the sum is 38.

The square root of 648857 is about 805.5166044223. The cubic root of 648857 is about 86.5731058047.

The spelling of 648857 in words is "six hundred forty-eight thousand, eight hundred fifty-seven".