664116 has 12 divisors (see below), whose sum is σ = 1549632. Its totient is φ = 221368.

The previous prime is 664109. The next prime is 664117. The reversal of 664116 is 611466.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×664116² = 882100122912, which contains 22 as substring.

It is a nude number because it is divisible by every one of its digits.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664117) by changing a digit.

664116 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 27660 + ... + 27683.

It is an arithmetic number, because the mean of its divisors is an integer number (129136).

2⁶⁶⁴¹¹⁶ is an apocalyptic number.

It is an amenable number.

664116 is an abundant number, since it is smaller than the sum of its proper divisors (885516).

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

664116 is a wasteful number, since it uses less digits than its factorization.

664116 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55350 (or 55348 counting only the distinct ones).

The product of its digits is 864, while the sum is 24.

The square root of 664116 is about 814.9331260907. The cubic root of 664116 is about 87.2464934566.

Subtracting from 664116 its reverse (611466), we obtain a triangular number (52650 = T₃₂₄).

It can be divided in two parts, 664 and 116, that added together give a triangular number (780 = T₃₉).

The spelling of 664116 in words is "six hundred sixty-four thousand, one hundred sixteen".