571664639 has 12 divisors (see below), whose sum is σ = 707454576. Its totient is φ = 452305152.

The previous prime is 571664623. The next prime is 571664641. The reversal of 571664639 is 936466175.

It is not a de Polignac number, because 571664639 - 2⁴ = 571664623 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 571664593 and 571664602.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (571664669) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 240434 + ... + 242799.

It is an arithmetic number, because the mean of its divisors is an integer number (58954548).

Almost surely, 2^571664639 is an apocalyptic number.

571664639 is a deficient number, since it is larger than the sum of its proper divisors (135789937).

571664639 is a wasteful number, since it uses less digits than its factorization.

571664639 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 483266 (or 483253 counting only the distinct ones).

The product of its digits is 816480, while the sum is 47.

The square root of 571664639 is about 23909.5093843433. The cubic root of 571664639 is about 829.9407897956.

The spelling of 571664639 in words is "five hundred seventy-one million, six hundred sixty-four thousand, six hundred thirty-nine".