664703026 has 48 divisors (see below), whose sum is σ = 1182875400. Its totient is φ = 278713344.

The previous prime is 664702993. The next prime is 664703041. The reversal of 664703026 is 620307466.

It can be written as a sum of positive squares in 12 ways, for example, as 14402025 + 650301001 = 3795^2 + 25501^2 .

It is a super-2 number, since 2×664703026² = 883660225547113352, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (34).

It is a junction number, because it is equal to n+sod(n) for n = 664702982 and 664703000.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 164640 + ... + 168628.

Almost surely, 2^664703026 is an apocalyptic number.

664703026 is a deficient number, since it is larger than the sum of its proper divisors (518172374).

664703026 is a wasteful number, since it uses less digits than its factorization.

664703026 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4063 (or 4050 counting only the distinct ones).

The product of its (nonzero) digits is 36288, while the sum is 34.

The square root of 664703026 is about 25781.8351945706. The cubic root of 664703026 is about 872.7219221861.

It can be divided in two parts, 66470 and 3026, that added together give a palindrome (69496).

The spelling of 664703026 in words is "six hundred sixty-four million, seven hundred three thousand, twenty-six".