63521920 has 128 divisors (see below), whose sum is σ = 189475200. Its totient is φ = 19783680.

The previous prime is 63521893. The next prime is 63521981. The reversal of 63521920 is 2912536.

It is a tau number, because it is divible by the number of its divisors (128).

It is a Harshad number since it is a multiple of its sum of digits (28).

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, 48636 + ... + 49924.

It is an arithmetic number, because the mean of its divisors is an integer number (1480275).

Almost surely, 2^63521920 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 63521920, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (94737600).

63521920 is an abundant number, since it is smaller than the sum of its proper divisors (125953280).

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

63521920 is a wasteful number, since it uses less digits than its factorization.

63521920 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1326 (or 1314 counting only the distinct ones).

The product of its (nonzero) digits is 3240, while the sum is 28.

The square root of 63521920 is about 7970.0639897055. The cubic root of 63521920 is about 399.0015096163.

The spelling of 63521920 in words is "sixty-three million, five hundred twenty-one thousand, nine hundred twenty".