664194 has 16 divisors (see below), whose sum is σ = 1386432. Its totient is φ = 211728.

The previous prime is 664193. The next prime is 664199. The reversal of 664194 is 491466.

It is not an unprimeable number, because it can be changed into a prime (664193) 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, 2269 + ... + 2544.

It is an arithmetic number, because the mean of its divisors is an integer number (86652).

2⁶⁶⁴¹⁹⁴ is an apocalyptic number.

664194 is an abundant number, since it is smaller than the sum of its proper divisors (722238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

664194 is a wasteful number, since it uses less digits than its factorization.

664194 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4841.

The product of its digits is 5184, while the sum is 30.

The square root of 664194 is about 814.9809813732. The cubic root of 664194 is about 87.2499090045.

It can be divided in two parts, 664 and 194, that added together give a palindrome (858).

The spelling of 664194 in words is "six hundred sixty-four thousand, one hundred ninety-four".