9640669 has 4 divisors (see below), whose sum is σ = 9647100. Its totient is φ = 9634240.

The previous prime is 9640667. The next prime is 9640693. The reversal of 9640669 is 9660469.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It can be written as a sum of positive squares in 2 ways, for example, as 700569 + 8940100 = 837^2 + 2990^2 .

It is a cyclic number.

It is not a de Polignac number, because 9640669 - 2¹ = 9640667 is a prime.

It is a super-2 number, since 2×9640669² = 185884997535122, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (9640661) 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, 357 + ... + 4405.

It is an arithmetic number, because the mean of its divisors is an integer number (2411775).

Almost surely, 2^9640669 is an apocalyptic number.

It is an amenable number.

9640669 is a deficient number, since it is larger than the sum of its proper divisors (6431).

9640669 is a wasteful number, since it uses less digits than its factorization.

9640669 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6430.

The product of its (nonzero) digits is 69984, while the sum is 40.

The square root of 9640669 is about 3104.9426725787. The cubic root of 9640669 is about 212.8314108969.

The spelling of 9640669 in words is "nine million, six hundred forty thousand, six hundred sixty-nine".