63643540 has 24 divisors (see below), whose sum is σ = 140686560. Its totient is φ = 24117408.

The previous prime is 63643519. The next prime is 63643577. The reversal of 63643540 is 4534636.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 83362 + ... + 84121.

It is an arithmetic number, because the mean of its divisors is an integer number (5861940).

Almost surely, 2^63643540 is an apocalyptic number.

It is an amenable number.

63643540 is an abundant number, since it is smaller than the sum of its proper divisors (77043020).

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

63643540 is a wasteful number, since it uses less digits than its factorization.

63643540 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 167511 (or 167509 counting only the distinct ones).

The product of its (nonzero) digits is 25920, while the sum is 31.

The square root of 63643540 is about 7977.6901418894. The cubic root of 63643540 is about 399.2559919882.

The spelling of 63643540 in words is "sixty-three million, six hundred forty-three thousand, five hundred forty".