649267760 has 20 divisors (see below), whose sum is σ = 1509547728. Its totient is φ = 259707072.

The previous prime is 649267739. The next prime is 649267763. The reversal of 649267760 is 67762946.

It is a tau number, because it is divible by the number of its divisors (20).

It is a Smith number, since the sum of its digits (47) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (649267763) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4057844 + ... + 4058003.

Almost surely, 2^649267760 is an apocalyptic number.

It is an amenable number.

649267760 is an abundant number, since it is smaller than the sum of its proper divisors (860279968).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

649267760 is a wasteful number, since it uses less digits than its factorization.

649267760 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8115860 (or 8115854 counting only the distinct ones).

The product of its (nonzero) digits is 762048, while the sum is 47.

The square root of 649267760 is about 25480.7331134722. The cubic root of 649267760 is about 865.9137036720.

The spelling of 649267760 in words is "six hundred forty-nine million, two hundred sixty-seven thousand, seven hundred sixty".