649812 has 12 divisors (see below), whose sum is σ = 1516256. Its totient is φ = 216600.

The previous prime is 649801. The next prime is 649813. The reversal of 649812 is 218946.

649812 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (12).

It is a self number, because there is not a number n which added to its sum of digits gives 649812.

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 649812.

It is not an unprimeable number, because it can be changed into a prime (649813) by changing a digit.

649812 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27064 + ... + 27087.

2⁶⁴⁹⁸¹² is an apocalyptic number.

It is an amenable number.

649812 is an abundant number, since it is smaller than the sum of its proper divisors (866444).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649812 is a wasteful number, since it uses less digits than its factorization.

649812 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54158 (or 54156 counting only the distinct ones).

The product of its digits is 3456, while the sum is 30.

The square root of 649812 is about 806.1091737476. The cubic root of 649812 is about 86.6155582954.

The spelling of 649812 in words is "six hundred forty-nine thousand, eight hundred twelve".