646466 has 4 divisors (see below), whose sum is σ = 969702. Its totient is φ = 323232.

The previous prime is 646453. The next prime is 646519. The reversal of 646466 is 664646.

It is a happy number.

646466 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 469225 + 177241 = 685^2 + 421^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 161615 + ... + 161618.

2⁶⁴⁶⁴⁶⁶ is an apocalyptic number.

646466 is a deficient number, since it is larger than the sum of its proper divisors (323236).

646466 is a wasteful number, since it uses less digits than its factorization.

646466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 323235.

The product of its digits is 20736, while the sum is 32.

The square root of 646466 is about 804.0310939261. The cubic root of 646466 is about 86.4666359795.

It can be divided in two parts, 6464 and 66, that multiplied together give a palindrome (426624).

The spelling of 646466 in words is "six hundred forty-six thousand, four hundred sixty-six".