649425872 has 10 divisors (see below), whose sum is σ = 1258262658. Its totient is φ = 324712928.

The previous prime is 649425839. The next prime is 649425919. The reversal of 649425872 is 278524946.

It can be written as a sum of positive squares in only one way, i.e., 346108816 + 303317056 = 18604^2 + 17416^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 20294543 + ... + 20294574.

Almost surely, 2^649425872 is an apocalyptic number.

It is an amenable number.

649425872 is a deficient number, since it is larger than the sum of its proper divisors (608836786).

649425872 is a wasteful number, since it uses less digits than its factorization.

649425872 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40589125 (or 40589119 counting only the distinct ones).

The product of its digits is 967680, while the sum is 47.

The square root of 649425872 is about 25483.8355040995. The cubic root of 649425872 is about 865.9839880979.

The spelling of 649425872 in words is "six hundred forty-nine million, four hundred twenty-five thousand, eight hundred seventy-two".