1563994784 has 48 divisors (see below), whose sum is σ = 3389934240. Its totient is φ = 704367360.

The previous prime is 1563994771. The next prime is 1563994787. The reversal of 1563994784 is 4874993651.

It is not an unprimeable number, because it can be changed into a prime (1563994787) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 17987 + ... + 58749.

It is an arithmetic number, because the mean of its divisors is an integer number (70623630).

Almost surely, 2^1563994784 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 1563994784, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1694967120).

1563994784 is an abundant number, since it is smaller than the sum of its proper divisors (1825939456).

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

1563994784 is a wasteful number, since it uses less digits than its factorization.

1563994784 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 40893 (or 40885 counting only the distinct ones).

The product of its digits is 6531840, while the sum is 56.

The square root of 1563994784 is about 39547.3739204008. The cubic root of 1563994784 is about 1160.7671263447.

The spelling of 1563994784 in words is "one billion, five hundred sixty-three million, nine hundred ninety-four thousand, seven hundred eighty-four".