1563944064 has 96 divisors (see below), whose sum is σ = 4343262000. Its totient is φ = 498584064.

The previous prime is 1563944021. The next prime is 1563944071. The reversal of 1563944064 is 4604493651.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (96).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 199287 + ... + 206985.

Almost surely, 2^1563944064 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 1563944064, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2171631000).

1563944064 is an abundant number, since it is smaller than the sum of its proper divisors (2779317936).

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

1563944064 is an equidigital number, since it uses as much as digits as its factorization.

1563944064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7762 (or 7727 counting only the distinct ones).

The product of its (nonzero) digits is 311040, while the sum is 42.

The square root of 1563944064 is about 39546.7326589694. The cubic root of 1563944064 is about 1160.7545784032.

The spelling of 1563944064 in words is "one billion, five hundred sixty-three million, nine hundred forty-four thousand, sixty-four".