6563977728 has 640 divisors, whose sum is σ = 24135598080. Its totient is φ = 1532805120.

The previous prime is 6563977703. The next prime is 6563977733. The reversal of 6563977728 is 8277793656.

It is a super-2 number, since 2×6563977728² = 86171607227360083968, which contains 22 as substring.

Its product of digits (26671680) is a multiple of the sum of its prime divisors (192).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 51684801 + ... + 51684927.

It is an arithmetic number, because the mean of its divisors is an integer number (37711872).

Almost surely, 2^6563977728 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 6563977728, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (12067799040).

6563977728 is an abundant number, since it is smaller than the sum of its proper divisors (17571620352).

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

6563977728 is a wasteful number, since it uses less digits than its factorization.

6563977728 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 208 (or 192 counting only the distinct ones).

The product of its digits is 26671680, while the sum is 60.

The square root of 6563977728 is about 81018.3789519390. The cubic root of 6563977728 is about 1872.3586134507.

The spelling of 6563977728 in words is "six billion, five hundred sixty-three million, nine hundred seventy-seven thousand, seven hundred twenty-eight".