649868 has 12 divisors (see below), whose sum is σ = 1168272. Its totient is φ = 316080.

The previous prime is 649867. The next prime is 649871. The reversal of 649868 is 868946.

649868 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (649867) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2048 + ... + 2343.

It is an arithmetic number, because the mean of its divisors is an integer number (97356).

2⁶⁴⁹⁸⁶⁸ is an apocalyptic number.

It is an amenable number.

649868 is a deficient number, since it is larger than the sum of its proper divisors (518404).

649868 is a wasteful number, since it uses less digits than its factorization.

649868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4432 (or 4430 counting only the distinct ones).

The product of its digits is 82944, while the sum is 41.

The square root of 649868 is about 806.1439077485. The cubic root of 649868 is about 86.6180463647.

The spelling of 649868 in words is "six hundred forty-nine thousand, eight hundred sixty-eight".