565555640 has 96 divisors (see below), whose sum is σ = 1406795040. Its totient is φ = 203412480.

The previous prime is 565555597. The next prime is 565555649. The reversal of 565555640 is 46555565.

565555640 is digitally balanced in base 2 and base 6, because in such bases it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (565555649) 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, 873797 + ... + 874443.

It is an arithmetic number, because the mean of its divisors is an integer number (14654115).

Almost surely, 2^565555640 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 565555640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (703397520).

565555640 is an abundant number, since it is smaller than the sum of its proper divisors (841239400).

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

565555640 is a wasteful number, since it uses less digits than its factorization.

565555640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 753 (or 708 counting only the distinct ones).

The product of its (nonzero) digits is 450000, while the sum is 41.

The square root of 565555640 is about 23781.4137510788. The cubic root of 565555640 is about 826.9738546467.

The spelling of 565555640 in words is "five hundred sixty-five million, five hundred fifty-five thousand, six hundred forty".