649286649 has 24 divisors (see below), whose sum is σ = 1024920000. Its totient is φ = 392814240.

The previous prime is 649286647. The next prime is 649286657. The reversal of 649286649 is 946682946.

It is not a de Polignac number, because 649286649 - 2¹ = 649286647 is a prime.

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 649286595 and 649286604.

It is not an unprimeable number, because it can be changed into a prime (649286641) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 53827 + ... + 64775.

It is an arithmetic number, because the mean of its divisors is an integer number (42705000).

Almost surely, 2^649286649 is an apocalyptic number.

It is an amenable number.

649286649 is a deficient number, since it is larger than the sum of its proper divisors (375633351).

649286649 is a wasteful number, since it uses less digits than its factorization.

649286649 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11565 (or 11562 counting only the distinct ones).

The product of its digits is 4478976, while the sum is 54.

The square root of 649286649 is about 25481.1037633773. The cubic root of 649286649 is about 865.9221008677.

The spelling of 649286649 in words is "six hundred forty-nine million, two hundred eighty-six thousand, six hundred forty-nine".