640179 has 12 divisors (see below), whose sum is σ = 936936. Its totient is φ = 421152.

The previous prime is 640163. The next prime is 640193. The reversal of 640179 is 971046.

640179 is a `hidden beast` number, since 640 + 17 + 9 = 666.

640179 is digitally balanced in base 2 and base 7, because in such bases it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 640179 - 2⁴ = 640163 is a prime.

640179 is strictly pandigital in base 7.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (640109) 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, 319 + ... + 1175.

It is an arithmetic number, because the mean of its divisors is an integer number (78078).

2⁶⁴⁰¹⁷⁹ is an apocalyptic number.

640179 is a deficient number, since it is larger than the sum of its proper divisors (296757).

640179 is a wasteful number, since it uses less digits than its factorization.

640179 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 946 (or 943 counting only the distinct ones).

The product of its (nonzero) digits is 1512, while the sum is 27.

The square root of 640179 is about 800.1118671786. Note that the first 3 decimals coincide. The cubic root of 640179 is about 86.1854210984.

The spelling of 640179 in words is "six hundred forty thousand, one hundred seventy-nine".