664450 has 24 divisors (see below), whose sum is σ = 1257732. Its totient is φ = 261120.

The previous prime is 664441. The next prime is 664459. The reversal of 664450 is 54466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664441) and next prime (664459).

It can be written as a sum of positive squares in 6 ways, for example, as 251001 + 413449 = 501^2 + 643^2 .

It is a Harshad number since it is a multiple of its sum of digits (25).

It is not an unprimeable number, because it can be changed into a prime (664459) by changing a digit.

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 11 ways as a sum of consecutive naturals, for example, 4782 + ... + 4918.

2⁶⁶⁴⁴⁵⁰ is an apocalyptic number.

664450 is a deficient number, since it is larger than the sum of its proper divisors (593282).

664450 is a wasteful number, since it uses less digits than its factorization.

664450 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 246 (or 241 counting only the distinct ones).

The product of its (nonzero) digits is 2880, while the sum is 25.

The square root of 664450 is about 815.1380251221. The cubic root of 664450 is about 87.2611171293.

The spelling of 664450 in words is "six hundred sixty-four thousand, four hundred fifty".