63520320408 has 128 divisors (see below), whose sum is σ = 163579530240. Its totient is φ = 20547072000.

The previous prime is 63520320359. The next prime is 63520320419. The reversal of 63520320408 is 80402302536.

It is a happy number.

63520320408 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×63520320408² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 69725473 + ... + 69726383.

It is an arithmetic number, because the mean of its divisors is an integer number (1277965080).

Almost surely, 2^63520320408 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 63520320408, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (81789765120).

63520320408 is an abundant number, since it is smaller than the sum of its proper divisors (100059209832).

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

63520320408 is a wasteful number, since it uses less digits than its factorization.

63520320408 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1569 (or 1565 counting only the distinct ones).

The product of its (nonzero) digits is 34560, while the sum is 33.

The spelling of 63520320408 in words is "sixty-three billion, five hundred twenty million, three hundred twenty thousand, four hundred eight".