7968643 has 4 divisors (see below), whose sum is σ = 8225728. Its totient is φ = 7711560.

The previous prime is 7968641. The next prime is 7968661. The reversal of 7968643 is 3468697.

It is a happy number.

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

It is not a de Polignac number, because 7968643 - 2¹ = 7968641 is a prime.

It is a super-2 number, since 2×7968643² = 126998542522898, which contains 22 as substring.

It is a d-powerful number, because it can be written as 7⁸ + 9⁴ + 6⁶ + 8⁷ + 6⁶ + 4⁴ + 3⁸ .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 7968643.

It is not an unprimeable number, because it can be changed into a prime (7968641) 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, 128496 + ... + 128557.

It is an arithmetic number, because the mean of its divisors is an integer number (2056432).

Almost surely, 2^7968643 is an apocalyptic number.

7968643 is a deficient number, since it is larger than the sum of its proper divisors (257085).

7968643 is a wasteful number, since it uses less digits than its factorization.

7968643 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 257084.

The product of its digits is 217728, while the sum is 43.

The square root of 7968643 is about 2822.8784954369. The cubic root of 7968643 is about 199.7383495110.

The spelling of 7968643 in words is "seven million, nine hundred sixty-eight thousand, six hundred forty-three".