649575650 has 12 divisors (see below), whose sum is σ = 1208210802. Its totient is φ = 259830240.

The previous prime is 649575649. The next prime is 649575691. The reversal of 649575650 is 56575946.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 554649601 + 94926049 = 23551^2 + 9743^2 .

It is a junction number, because it is equal to n+sod(n) for n = 649575595 and 649575604.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6495707 + ... + 6495806.

Almost surely, 2^649575650 is an apocalyptic number.

649575650 is a deficient number, since it is larger than the sum of its proper divisors (558635152).

649575650 is a wasteful number, since it uses less digits than its factorization.

649575650 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12991525 (or 12991520 counting only the distinct ones).

The product of its (nonzero) digits is 1134000, while the sum is 47.

The square root of 649575650 is about 25486.7740210486. The cubic root of 649575650 is about 866.0505573479.

It can be divided in two parts, 64957 and 5650, that added together give a palindrome (70607).

The spelling of 649575650 in words is "six hundred forty-nine million, five hundred seventy-five thousand, six hundred fifty".