1563087988 has 24 divisors (see below), whose sum is σ = 3410374464. Its totient is φ = 608995200.

The previous prime is 1563087971. The next prime is 1563087989. The reversal of 1563087988 is 8897803651.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1563087989) 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, 2537173 + ... + 2537788.

It is an arithmetic number, because the mean of its divisors is an integer number (142098936).

Almost surely, 2^1563087988 is an apocalyptic number.

It is an amenable number.

1563087988 is an abundant number, since it is smaller than the sum of its proper divisors (1847286476).

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

1563087988 is a wasteful number, since it uses less digits than its factorization.

1563087988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5074983 (or 5074981 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 55.

The square root of 1563087988 is about 39535.9075777957. The cubic root of 1563087988 is about 1160.5427474039.

The spelling of 1563087988 in words is "one billion, five hundred sixty-three million, eighty-seven thousand, nine hundred eighty-eight".