9664781 has 8 divisors (see below), whose sum is σ = 11185920. Its totient is φ = 8178768.

The previous prime is 9664771. The next prime is 9664793. The reversal of 9664781 is 1874669.

9664781 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 9664781 - 2⁶ = 9664717 is a prime.

It is a super-2 number, since 2×9664781² = 186815983555922, 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 (9664741) 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, 8186 + ... + 9291.

It is an arithmetic number, because the mean of its divisors is an integer number (1398240).

Almost surely, 2^9664781 is an apocalyptic number.

It is an amenable number.

9664781 is a deficient number, since it is larger than the sum of its proper divisors (1521139).

9664781 is a wasteful number, since it uses less digits than its factorization.

9664781 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 17563.

The product of its digits is 72576, while the sum is 41.

The square root of 9664781 is about 3108.8230892092. The cubic root of 9664781 is about 213.0086986830.

The spelling of 9664781 in words is "nine million, six hundred sixty-four thousand, seven hundred eighty-one".