63645560 has 64 divisors (see below), whose sum is σ = 158284800. Its totient is φ = 22838400.

The previous prime is 63645559. The next prime is 63645583. The reversal of 63645560 is 6554636.

It is a self number, because there is not a number n which added to its sum of digits gives 63645560.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 33845 + ... + 35675.

It is an arithmetic number, because the mean of its divisors is an integer number (2473200).

Almost surely, 2^63645560 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63645560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (79142400).

63645560 is an abundant number, since it is smaller than the sum of its proper divisors (94639240).

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

63645560 is a wasteful number, since it uses less digits than its factorization.

63645560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1932 (or 1928 counting only the distinct ones).

The product of its (nonzero) digits is 64800, while the sum is 35.

The square root of 63645560 is about 7977.8167439469. The cubic root of 63645560 is about 399.2602159758.

The spelling of 63645560 in words is "sixty-three million, six hundred forty-five thousand, five hundred sixty".