664206 has 16 divisors (see below), whose sum is σ = 1371648. Its totient is φ = 214200.

The previous prime is 664199. The next prime is 664211. The reversal of 664206 is 602466.

It is a super-2 number, since 2×664206² = 882339220872, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1600 + ... + 1971.

It is an arithmetic number, because the mean of its divisors is an integer number (85728).

2⁶⁶⁴²⁰⁶ is an apocalyptic number.

664206 is an abundant number, since it is smaller than the sum of its proper divisors (707442).

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

664206 is a wasteful number, since it uses less digits than its factorization.

664206 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3607.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 664206 is about 814.9883434749. The cubic root of 664206 is about 87.2504344497.

The spelling of 664206 in words is "six hundred sixty-four thousand, two hundred six".