63730640 has 20 divisors (see below), whose sum is σ = 148173924. Its totient is φ = 25492224.

The previous prime is 63730633. The next prime is 63730663. The reversal of 63730640 is 4603736.

It can be written as a sum of positive squares in 2 ways, for example, as 37063744 + 26666896 = 6088^2 + 5164^2 .

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

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 398237 + ... + 398396.

Almost surely, 2^63730640 is an apocalyptic number.

It is an amenable number.

63730640 is an abundant number, since it is smaller than the sum of its proper divisors (84443284).

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

63730640 is a wasteful number, since it uses less digits than its factorization.

63730640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 796646 (or 796640 counting only the distinct ones).

The product of its (nonzero) digits is 9072, while the sum is 29.

The square root of 63730640 is about 7983.1472490491. The cubic root of 63730640 is about 399.4380442173.

The spelling of 63730640 in words is "sixty-three million, seven hundred thirty thousand, six hundred forty".