640854175 has 24 divisors (see below), whose sum is σ = 893005344. Its totient is φ = 452664960.

The previous prime is 640854169. The next prime is 640854187. The reversal of 640854175 is 571458046.

640854175 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640854175 - 2⁹ = 640853663 is a prime.

It is a super-2 number, since 2×640854175² = 821388147229861250, which contains 22 as substring.

It is a hoax number, since the sum of its digits (40) coincides with the sum of the digits of its distinct prime factors.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 35392 + ... + 50341.

It is an arithmetic number, because the mean of its divisors is an integer number (37208556).

Almost surely, 2^640854175 is an apocalyptic number.

640854175 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

640854175 is a deficient number, since it is larger than the sum of its proper divisors (252151169).

640854175 is a wasteful number, since it uses less digits than its factorization.

640854175 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 85779 (or 85774 counting only the distinct ones).

The product of its (nonzero) digits is 134400, while the sum is 40.

The square root of 640854175 is about 25315.0977679329. The cubic root of 640854175 is about 862.1570939619.

The spelling of 640854175 in words is "six hundred forty million, eight hundred fifty-four thousand, one hundred seventy-five".