1563445320 has 128 divisors (see below), whose sum is σ = 4857200640. Its totient is φ = 402174720.

The previous prime is 1563445319. The next prime is 1563445327. The reversal of 1563445320 is 235443651.

It is a super-2 number, since 2×1563445320² = 4888722537259804800, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (1563445327) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1811209 + ... + 1812071.

It is an arithmetic number, because the mean of its divisors is an integer number (37946880).

Almost surely, 2^1563445320 is an apocalyptic number.

1563445320 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 1563445320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2428600320).

1563445320 is an abundant number, since it is smaller than the sum of its proper divisors (3293755320).

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

1563445320 is a wasteful number, since it uses less digits than its factorization.

1563445320 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1395 (or 1391 counting only the distinct ones).

The product of its (nonzero) digits is 43200, while the sum is 33.

The square root of 1563445320 is about 39540.4264013427. The cubic root of 1563445320 is about 1160.6311765193.

Adding to 1563445320 its reverse (235443651), we get a palindrome (1798888971).

The spelling of 1563445320 in words is "one billion, five hundred sixty-three million, four hundred forty-five thousand, three hundred twenty".