649884 has 24 divisors (see below), whose sum is σ = 1566208. Its totient is φ = 209520.

The previous prime is 649879. The next prime is 649897. The reversal of 649884 is 488946.

It is an Ulam number.

It is a congruent number.

It is an unprimeable number.

649884 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

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, 502 + ... + 1245.

2⁶⁴⁹⁸⁸⁴ is an apocalyptic number.

It is an amenable number.

649884 is an abundant number, since it is smaller than the sum of its proper divisors (916324).

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

649884 is a wasteful number, since it uses less digits than its factorization.

649884 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1785 (or 1783 counting only the distinct ones).

The product of its digits is 55296, while the sum is 39.

The square root of 649884 is about 806.1538314739. The cubic root of 649884 is about 86.6187572154.

It can be divided in two parts, 64988 and 4, that multiplied together give a palindrome (259952).

The spelling of 649884 in words is "six hundred forty-nine thousand, eight hundred eighty-four".