63521435628 has 192 divisors, whose sum is σ = 199453363200. Its totient is φ = 17095518720.

The previous prime is 63521435623. The next prime is 63521435693. The reversal of 63521435628 is 82653412536.

63521435628 is a `hidden beast` number, since 6 + 3 + 5 + 2 + 14 + 3 + 5 + 628 = 666.

It is not an unprimeable number, because it can be changed into a prime (63521435623) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 863551 + ... + 934217.

It is an arithmetic number, because the mean of its divisors is an integer number (1038819600).

Almost surely, 2^63521435628 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 63521435628, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (99726681600).

63521435628 is an abundant number, since it is smaller than the sum of its proper divisors (135931927572).

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

63521435628 is a wasteful number, since it uses less digits than its factorization.

63521435628 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70757 (or 70749 counting only the distinct ones).

The product of its digits is 1036800, while the sum is 45.

The spelling of 63521435628 in words is "sixty-three billion, five hundred twenty-one million, four hundred thirty-five thousand, six hundred twenty-eight".