640090171 has 8 divisors (see below), whose sum is σ = 774563040. Its totient is φ = 516375168.

The previous prime is 640090159. The next prime is 640090211. The reversal of 640090171 is 171090046.

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 640090171 - 2⁷ = 640090043 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (640090571) 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, 2689336 + ... + 2689573.

It is an arithmetic number, because the mean of its divisors is an integer number (96820380).

Almost surely, 2^640090171 is an apocalyptic number.

640090171 is a deficient number, since it is larger than the sum of its proper divisors (134472869).

640090171 is a wasteful number, since it uses less digits than its factorization.

640090171 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5378933.

The product of its (nonzero) digits is 1512, while the sum is 28.

The square root of 640090171 is about 25300.0033794464. The cubic root of 640090171 is about 861.8143465143.

The spelling of 640090171 in words is "six hundred forty million, ninety thousand, one hundred seventy-one".