664442026 has 16 divisors (see below), whose sum is σ = 1050489000. Its totient is φ = 314711488.

The previous prime is 664442021. The next prime is 664442033. The reversal of 664442026 is 620244466.

664442026 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 4 ways, for example, as 522808225 + 141633801 = 22865^2 + 11901^2 .

It is a junction number, because it is equal to n+sod(n) for n = 664441982 and 664442000.

It is not an unprimeable number, because it can be changed into a prime (664442021) 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, 105001 + ... + 111148.

Almost surely, 2^664442026 is an apocalyptic number.

664442026 is a deficient number, since it is larger than the sum of its proper divisors (386046974).

664442026 is a wasteful number, since it uses less digits than its factorization.

664442026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 216233.

The product of its (nonzero) digits is 55296, while the sum is 34.

The square root of 664442026 is about 25776.7729943063. The cubic root of 664442026 is about 872.6076805712.

The spelling of 664442026 in words is "six hundred sixty-four million, four hundred forty-two thousand, twenty-six".