63965520 has 120 divisors (see below), whose sum is σ = 217939176. Its totient is φ = 16809984.

The previous prime is 63965519. The next prime is 63965537. The reversal of 63965520 is 2556936.

It can be written as a sum of positive squares in 4 ways, for example, as 4613904 + 59351616 = 2148^2 + 7704^2 .

It is a tau number, because it is divible by the number of its divisors (120).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 51952 + ... + 53168.

Almost surely, 2^63965520 is an apocalyptic number.

63965520 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 63965520, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (108969588).

63965520 is an abundant number, since it is smaller than the sum of its proper divisors (153973656).

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

63965520 is a wasteful number, since it uses less digits than its factorization.

63965520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1309 (or 1300 counting only the distinct ones).

The product of its (nonzero) digits is 48600, while the sum is 36.

The square root of 63965520 is about 7997.8447096702. The cubic root of 63965520 is about 399.9281537627.

The spelling of 63965520 in words is "sixty-three million, nine hundred sixty-five thousand, five hundred twenty".