1563778064 has 20 divisors (see below), whose sum is σ = 3111708204. Its totient is φ = 760756608.

The previous prime is 1563778063. The next prime is 1563778081. The reversal of 1563778064 is 4608773651.

It can be written as a sum of positive squares in 2 ways, for example, as 835210000 + 728568064 = 28900^2 + 26992^2 .

It is not an unprimeable number, because it can be changed into a prime (1563778063) 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, 1320167 + ... + 1321350.

Almost surely, 2^1563778064 is an apocalyptic number.

It is an amenable number.

1563778064 is a deficient number, since it is larger than the sum of its proper divisors (1547930140).

1563778064 is a wasteful number, since it uses less digits than its factorization.

1563778064 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2641562 (or 2641556 counting only the distinct ones).

The product of its (nonzero) digits is 846720, while the sum is 47.

The square root of 1563778064 is about 39544.6338205325. The cubic root of 1563778064 is about 1160.7135087166.

The spelling of 1563778064 in words is "one billion, five hundred sixty-three million, seven hundred seventy-eight thousand, sixty-four".