9641640 has 32 divisors (see below), whose sum is σ = 28925280. Its totient is φ = 2571072.

The previous prime is 9641633. The next prime is 9641647. The reversal of 9641640 is 461469.

It is an interprime number because it is at equal distance from previous prime (9641633) and next prime (9641647).

It is a super-2 number, since 2×9641640² = 185922443779200, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (30).

It is a junction number, because it is equal to n+sod(n) for n = 9641598 and 9641607.

It is not an unprimeable number, because it can be changed into a prime (9641647) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 40054 + ... + 40293.

It is an arithmetic number, because the mean of its divisors is an integer number (903915).

Almost surely, 2^9641640 is an apocalyptic number.

It is an amenable number.

9641640 is an abundant number, since it is smaller than the sum of its proper divisors (19283640).

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

9641640 is a wasteful number, since it uses less digits than its factorization.

9641640 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80361 (or 80357 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The square root of 9641640 is about 3105.0990322371. The cubic root of 9641640 is about 212.8385560568.

The spelling of 9641640 in words is "nine million, six hundred forty-one thousand, six hundred forty".