664412 has 24 divisors (see below), whose sum is σ = 1354080. Its totient is φ = 279360.

The previous prime is 664403. The next prime is 664421. The reversal of 664412 is 214466.

It is a happy number.

It is an interprime number because it is at equal distance from previous prime (664403) and next prime (664421).

It is a plaindrome in base 9.

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, 1514 + ... + 1902.

It is an arithmetic number, because the mean of its divisors is an integer number (56420).

2⁶⁶⁴⁴¹² is an apocalyptic number.

It is an amenable number.

664412 is an abundant number, since it is smaller than the sum of its proper divisors (689668).

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

664412 is a wasteful number, since it uses less digits than its factorization.

664412 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 461 (or 459 counting only the distinct ones).

The product of its digits is 1152, while the sum is 23.

The square root of 664412 is about 815.1147158529. The cubic root of 664412 is about 87.2594536052.

Adding to 664412 its reverse (214466), we get a palindrome (878878).

It can be divided in two parts, 66 and 4412, that multiplied together give a palindrome (291192).

The spelling of 664412 in words is "six hundred sixty-four thousand, four hundred twelve".