565904640 has 288 divisors, whose sum is σ = 2125105920. Its totient is φ = 125632512.

The previous prime is 565904623. The next prime is 565904671. The reversal of 565904640 is 46409565.

565904640 is digitally balanced in base 6, because in such base it contains all the possibile digits an equal number of times.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 994276 + ... + 994844.

It is an arithmetic number, because the mean of its divisors is an integer number (7378840).

Almost surely, 2^565904640 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 565904640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (1062552960).

565904640 is an abundant number, since it is smaller than the sum of its proper divisors (1559201280).

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

565904640 is a wasteful number, since it uses less digits than its factorization.

565904640 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 637 (or 623 counting only the distinct ones).

The product of its (nonzero) digits is 129600, while the sum is 39.

The square root of 565904640 is about 23788.7502824339. The cubic root of 565904640 is about 827.1439260527.

The spelling of 565904640 in words is "five hundred sixty-five million, nine hundred four thousand, six hundred forty".