9664819 has 4 divisors (see below), whose sum is σ = 9678096. Its totient is φ = 9651544.

The previous prime is 9664813. The next prime is 9664841. The reversal of 9664819 is 9184669.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 9664819 - 2⁷ = 9664691 is a prime.

It is a super-2 number, since 2×9664819² = 186817452605522, which contains 22 as substring.

It is a Duffinian number.

9664819 is a lucky number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9664813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 5479 + ... + 7024.

It is an arithmetic number, because the mean of its divisors is an integer number (2419524).

Almost surely, 2^9664819 is an apocalyptic number.

9664819 is a deficient number, since it is larger than the sum of its proper divisors (13277).

9664819 is a wasteful number, since it uses less digits than its factorization.

9664819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13276.

The product of its digits is 93312, while the sum is 43.

The square root of 9664819 is about 3108.8292008407. The cubic root of 9664819 is about 213.0089778519.

The spelling of 9664819 in words is "nine million, six hundred sixty-four thousand, eight hundred nineteen".