649804 has 6 divisors (see below), whose sum is σ = 1137164. Its totient is φ = 324900.

The previous prime is 649801. The next prime is 649813. The reversal of 649804 is 408946.

649804 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a plaindrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (649801) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 81222 + ... + 81229.

2⁶⁴⁹⁸⁰⁴ is an apocalyptic number.

It is an amenable number.

649804 is a deficient number, since it is larger than the sum of its proper divisors (487360).

649804 is a wasteful number, since it uses less digits than its factorization.

649804 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 162455 (or 162453 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 31.

The square root of 649804 is about 806.1042116253. The cubic root of 649804 is about 86.6152028452.

The spelling of 649804 in words is "six hundred forty-nine thousand, eight hundred four".