306664 has 8 divisors (see below), whose sum is σ = 575010. Its totient is φ = 153328.

The previous prime is 306661. The next prime is 306689. The reversal of 306664 is 466603.

It is a happy number.

It can be written as a sum of positive squares in only one way, i.e., 240100 + 66564 = 490^2 + 258^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a nialpdrome in base 13.

It is not an unprimeable number, because it can be changed into a prime (306661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19159 + ... + 19174.

2³⁰⁶⁶⁶⁴ is an apocalyptic number.

It is an amenable number.

306664 is a deficient number, since it is larger than the sum of its proper divisors (268346).

306664 is a wasteful number, since it uses less digits than its factorization.

306664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 38339 (or 38335 counting only the distinct ones).

The product of its (nonzero) digits is 2592, while the sum is 25.

The square root of 306664 is about 553.7725164722. The cubic root of 306664 is about 67.4353473307.

The spelling of 306664 in words is "three hundred six thousand, six hundred sixty-four".