649640630 has 16 divisors (see below), whose sum is σ = 1169683200. Its totient is φ = 259782912.

The previous prime is 649640623. The next prime is 649640639. The reversal of 649640630 is 36046946.

It is a happy number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (649640639) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 41222 + ... + 54758.

It is an arithmetic number, because the mean of its divisors is an integer number (73105200).

Almost surely, 2^649640630 is an apocalyptic number.

649640630 is a deficient number, since it is larger than the sum of its proper divisors (520042570).

649640630 is a wasteful number, since it uses less digits than its factorization.

649640630 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18343.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 649640630 is about 25488.0487680011. The cubic root of 649640630 is about 866.0794347075.

The spelling of 649640630 in words is "six hundred forty-nine million, six hundred forty thousand, six hundred thirty".