649736 has 16 divisors (see below), whose sum is σ = 1226940. Its totient is φ = 322560.

The previous prime is 649717. The next prime is 649739. The reversal of 649736 is 637946.

It can be written as a sum of positive squares in 2 ways, for example, as 649636 + 100 = 806^2 + 10^2 .

It is a junction number, because it is equal to n+sod(n) for n = 649696 and 649705.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649739) by changing a digit.

649736 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 in 3 ways as a sum of consecutive naturals, for example, 1760 + ... + 2096.

2⁶⁴⁹⁷³⁶ is an apocalyptic number.

It is an amenable number.

649736 is a deficient number, since it is larger than the sum of its proper divisors (577204).

649736 is a wasteful number, since it uses less digits than its factorization.

649736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 584 (or 580 counting only the distinct ones).

The product of its digits is 27216, while the sum is 35.

The square root of 649736 is about 806.0620323523. The cubic root of 649736 is about 86.6121814012.

The spelling of 649736 in words is "six hundred forty-nine thousand, seven hundred thirty-six".