664226604 has 18 divisors (see below), whose sum is σ = 1679017340. Its totient is φ = 221408856.

The previous prime is 664226597. The next prime is 664226611. The reversal of 664226604 is 406622466.

664226604 is a `hidden beast` number, since 6 + 6 + 42 + 2 + 6 + 604 = 666.

It is an interprime number because it is at equal distance from previous prime (664226597) and next prime (664226611).

It is a tau number, because it is divible by the number of its divisors (18).

It is a super-2 number, since 2×664226604² = 882393962922745632, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36), and also a Moran number because the ratio is a prime number: 18450739 = 664226604 / (6 + 6 + 4 + 2 + 2 + 6 + 6 + 0 + 4).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 9225334 + ... + 9225405.

Almost surely, 2^664226604 is an apocalyptic number.

It is an amenable number.

664226604 is an abundant number, since it is smaller than the sum of its proper divisors (1014790736).

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

664226604 is a wasteful number, since it uses less digits than its factorization.

664226604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18450749 (or 18450744 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 36.

The square root of 664226604 is about 25772.5940487177. The cubic root of 664226604 is about 872.5133662427.

The spelling of 664226604 in words is "six hundred sixty-four million, two hundred twenty-six thousand, six hundred four".