1563225920 has 28 divisors (see below), whose sum is σ = 3722432484. Its totient is φ = 625290240.

The previous prime is 1563225883. The next prime is 1563225959. The reversal of 1563225920 is 295223651.

It can be written as a sum of positive squares in 2 ways, for example, as 509314624 + 1053911296 = 22568^2 + 32464^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2442221 + ... + 2442860.

Almost surely, 2^1563225920 is an apocalyptic number.

1563225920 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1563225920 is an abundant number, since it is smaller than the sum of its proper divisors (2159206564).

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

1563225920 is an equidigital number, since it uses as much as digits as its factorization.

1563225920 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4885098 (or 4885088 counting only the distinct ones).

The product of its (nonzero) digits is 32400, while the sum is 35.

The square root of 1563225920 is about 39537.6519282569. The cubic root of 1563225920 is about 1160.5768830966.

The spelling of 1563225920 in words is "one billion, five hundred sixty-three million, two hundred twenty-five thousand, nine hundred twenty".