1563787648 has 32 divisors (see below), whose sum is σ = 3222792000. Its totient is φ = 754930176.

The previous prime is 1563787637. The next prime is 1563787649. The reversal of 1563787648 is 8467873651.

It is a tau number, because it is divible by the number of its divisors (32).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1563787649) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 206928 + ... + 214351.

It is an arithmetic number, because the mean of its divisors is an integer number (100712250).

Almost surely, 2^1563787648 is an apocalyptic number.

It is an amenable number.

1563787648 is an abundant number, since it is smaller than the sum of its proper divisors (1659004352).

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

1563787648 is an equidigital number, since it uses as much as digits as its factorization.

1563787648 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 421322 (or 421310 counting only the distinct ones).

The product of its digits is 6773760, while the sum is 55.

The square root of 1563787648 is about 39544.7549998732. The cubic root of 1563787648 is about 1160.7158799516.

It can be divided in two parts, 15637 and 87648, that added together give a triangular number (103285 = T₄₅₄).

The spelling of 1563787648 in words is "one billion, five hundred sixty-three million, seven hundred eighty-seven thousand, six hundred forty-eight".