571664640 has 144 divisors (see below), whose sum is σ = 1870799616. Its totient is φ = 148684800.

The previous prime is 571664623. The next prime is 571664641. The reversal of 571664640 is 46466175.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (571664641) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 155625 + ... + 159255.

It is an arithmetic number, because the mean of its divisors is an integer number (12991664).

Almost surely, 2^571664640 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 571664640, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (935399808).

571664640 is an abundant number, since it is smaller than the sum of its proper divisors (1299134976).

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

571664640 is a wasteful number, since it uses less digits than its factorization.

571664640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3696 (or 3682 counting only the distinct ones).

The product of its (nonzero) digits is 120960, while the sum is 39.

The square root of 571664640 is about 23909.5094052555. The cubic root of 571664640 is about 829.9407902796.

The spelling of 571664640 in words is "five hundred seventy-one million, six hundred sixty-four thousand, six hundred forty".