640468571 has 8 divisors (see below), whose sum is σ = 642734400. Its totient is φ = 638208000.

The previous prime is 640468559. The next prime is 640468583. The reversal of 640468571 is 175864046.

640468571 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an interprime number because it is at equal distance from previous prime (640468559) and next prime (640468583).

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 640468571 - 2²² = 636274267 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640468501) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 576965 + ... + 578073.

It is an arithmetic number, because the mean of its divisors is an integer number (80341800).

Almost surely, 2^640468571 is an apocalyptic number.

640468571 is a deficient number, since it is larger than the sum of its proper divisors (2265829).

640468571 is a wasteful number, since it uses less digits than its factorization.

640468571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2629.

The product of its (nonzero) digits is 161280, while the sum is 41.

The square root of 640468571 is about 25307.4805344191. The cubic root of 640468571 is about 861.9841383774.

The spelling of 640468571 in words is "six hundred forty million, four hundred sixty-eight thousand, five hundred seventy-one".