664499 has 8 divisors (see below), whose sum is σ = 730992. Its totient is φ = 599040.

The previous prime is 664471. The next prime is 664507. The reversal of 664499 is 994466.

664499 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 664499 - 2⁸ = 664243 is a prime.

It is a Duffinian number.

It is a zygodrome in base 10.

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

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1967 + ... + 2279.

It is an arithmetic number, because the mean of its divisors is an integer number (91374).

2⁶⁶⁴⁴⁹⁹ is an apocalyptic number.

664499 is a deficient number, since it is larger than the sum of its proper divisors (66493).

664499 is a wasteful number, since it uses less digits than its factorization.

664499 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 517.

The product of its digits is 46656, while the sum is 38.

The square root of 664499 is about 815.1680808275. The cubic root of 664499 is about 87.2632621061.

It can be divided in two parts, 6644 and 99, that multiplied together give a palindrome (657756).

The spelling of 664499 in words is "six hundred sixty-four thousand, four hundred ninety-nine".