649712 has 20 divisors (see below), whose sum is σ = 1438896. Its totient is φ = 278400.

The previous prime is 649709. The next prime is 649717. The reversal of 649712 is 217946.

It is a Smith number, since the sum of its digits (29) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649717) by changing a digit.

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 3 ways as a sum of consecutive naturals, for example, 2789 + ... + 3012.

2⁶⁴⁹⁷¹² is an apocalyptic number.

It is an amenable number.

649712 is an abundant number, since it is smaller than the sum of its proper divisors (789184).

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

649712 is a wasteful number, since it uses less digits than its factorization.

649712 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5816 (or 5810 counting only the distinct ones).

The product of its digits is 3024, while the sum is 29.

The square root of 649712 is about 806.0471450232. The cubic root of 649712 is about 86.6111149588.

The spelling of 649712 in words is "six hundred forty-nine thousand, seven hundred twelve".