563771988 has 120 divisors (see below), whose sum is σ = 1600403112. Its totient is φ = 172025856.

The previous prime is 563771959. The next prime is 563772007. The reversal of 563771988 is 889177365.

563771988 is a `hidden beast` number, since 563 + 7 + 71 + 9 + 8 + 8 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 132296004 + 431475984 = 11502^2 + 20772^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (54).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 576556 + ... + 577532.

Almost surely, 2^563771988 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 563771988, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (800201556).

563771988 is an abundant number, since it is smaller than the sum of its proper divisors (1036631124).

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

563771988 is a wasteful number, since it uses less digits than its factorization.

563771988 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1143 (or 1132 counting only the distinct ones).

The product of its digits is 2540160, while the sum is 54.

The square root of 563771988 is about 23743.8831701978. The cubic root of 563771988 is about 826.1035677737.

The spelling of 563771988 in words is "five hundred sixty-three million, seven hundred seventy-one thousand, nine hundred eighty-eight".