63440540 has 12 divisors (see below), whose sum is σ = 133225176. Its totient is φ = 25376208.

The previous prime is 63440537. The next prime is 63440551. The reversal of 63440540 is 4504436.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1585994 + ... + 1586033.

It is an arithmetic number, because the mean of its divisors is an integer number (11102098).

Almost surely, 2^63440540 is an apocalyptic number.

It is an amenable number.

63440540 is an abundant number, since it is smaller than the sum of its proper divisors (69784636).

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

63440540 is a wasteful number, since it uses less digits than its factorization.

63440540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3172036 (or 3172034 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 26.

The square root of 63440540 is about 7964.9569992562. The cubic root of 63440540 is about 398.8310455247.

Adding to 63440540 its reverse (4504436), we get a palindrome (67944976).

The spelling of 63440540 in words is "sixty-three million, four hundred forty thousand, five hundred forty".