649784 has 8 divisors (see below), whose sum is σ = 1218360. Its totient is φ = 324888.

The previous prime is 649783. The next prime is 649787. The reversal of 649784 is 487946.

It is a happy number.

649784 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 (8).

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 649784.

It is not an unprimeable number, because it can be changed into a prime (649783) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 40604 + ... + 40619.

It is an arithmetic number, because the mean of its divisors is an integer number (152295).

2⁶⁴⁹⁷⁸⁴ is an apocalyptic number.

It is an amenable number.

649784 is a deficient number, since it is larger than the sum of its proper divisors (568576).

649784 is a wasteful number, since it uses less digits than its factorization.

649784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81229 (or 81225 counting only the distinct ones).

The product of its digits is 48384, while the sum is 38.

The square root of 649784 is about 806.0918061859. The cubic root of 649784 is about 86.6143142071.

The spelling of 649784 in words is "six hundred forty-nine thousand, seven hundred eighty-four".