664026 has 16 divisors (see below), whose sum is σ = 1448928. Its totient is φ = 201200.

The previous prime is 664019. The next prime is 664043. The reversal of 664026 is 620466.

It is a junction number, because it is equal to n+sod(n) for n = 663987 and 664005.

It is an unprimeable number.

664026 is an untouchable number, because it is not equal to the sum of proper divisors of any number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4965 + ... + 5096.

It is an arithmetic number, because the mean of its divisors is an integer number (90558).

2⁶⁶⁴⁰²⁶ is an apocalyptic number.

664026 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

664026 is an abundant number, since it is smaller than the sum of its proper divisors (784902).

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

664026 is a wasteful number, since it uses less digits than its factorization.

664026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10077.

The product of its (nonzero) digits is 1728, while the sum is 24.

The square root of 664026 is about 814.8779049649. The cubic root of 664026 is about 87.2425521074.

It can be divided in two parts, 6640 and 26, that added together give a palindrome (6666).

The spelling of 664026 in words is "six hundred sixty-four thousand, twenty-six".