649744 has 10 divisors (see below), whose sum is σ = 1258910. Its totient is φ = 324864.

The previous prime is 649739. The next prime is 649751. The reversal of 649744 is 447946.

It can be written as a sum of positive squares in only one way, i.e., 473344 + 176400 = 688^2 + 420^2 .

It is a super-3 number, since 3×649744³ = 822901943335268352, which contains 333 as substring.

It is an unprimeable number.

649744 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 as a sum of consecutive naturals, namely, 20289 + ... + 20320.

It is an arithmetic number, because the mean of its divisors is an integer number (125891).

2⁶⁴⁹⁷⁴⁴ is an apocalyptic number.

It is an amenable number.

649744 is a deficient number, since it is larger than the sum of its proper divisors (609166).

649744 is a wasteful number, since it uses less digits than its factorization.

649744 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40617 (or 40611 counting only the distinct ones).

The product of its digits is 24192, while the sum is 34.

The square root of 649744 is about 806.0669947343. The cubic root of 649744 is about 86.6125368761.

The spelling of 649744 in words is "six hundred forty-nine thousand, seven hundred forty-four".