1285565568 has 192 divisors, whose sum is σ = 4207010400. Its totient is φ = 345612288.

The previous prime is 1285565513. The next prime is 1285565569. The reversal of 1285565568 is 8655655821.

It is a tau number, because it is divible by the number of its divisors (192).

It is a Harshad number since it is a multiple of its sum of digits (51).

It is a self number, because there is not a number n which added to its sum of digits gives 1285565568.

It is not an unprimeable number, because it can be changed into a prime (1285565569) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 317863 + ... + 321881.

Almost surely, 2^1285565568 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 1285565568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (2103505200).

1285565568 is an abundant number, since it is smaller than the sum of its proper divisors (2921444832).

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

1285565568 is a wasteful number, since it uses less digits than its factorization.

1285565568 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4067 (or 4048 counting only the distinct ones).

The product of its digits is 2880000, while the sum is 51.

The square root of 1285565568 is about 35854.7844506141. The cubic root of 1285565568 is about 1087.3384458653.

The spelling of 1285565568 in words is "one billion, two hundred eighty-five million, five hundred sixty-five thousand, five hundred sixty-eight".