1563639680 has 64 divisors (see below), whose sum is σ = 3757741200. Its totient is φ = 622166016.

The previous prime is 1563639631. The next prime is 1563639689. The reversal of 1563639680 is 869363651.

1563639680 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (64).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1563639689) 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, 117191 + ... + 129849.

Almost surely, 2^1563639680 is an apocalyptic number.

1563639680 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 1563639680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1878870600).

1563639680 is an abundant number, since it is smaller than the sum of its proper divisors (2194101520).

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

1563639680 is a wasteful number, since it uses less digits than its factorization.

1563639680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12871 (or 12859 counting only the distinct ones).

The product of its (nonzero) digits is 699840, while the sum is 47.

The square root of 1563639680 is about 39542.8840627489. The cubic root of 1563639680 is about 1160.6792692210.

The spelling of 1563639680 in words is "one billion, five hundred sixty-three million, six hundred thirty-nine thousand, six hundred eighty".