7961647 has 4 divisors (see below), whose sum is σ = 8005816. Its totient is φ = 7917480.

The previous prime is 7961621. The next prime is 7961651. The reversal of 7961647 is 7461697.

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 7961647 - 2¹¹ = 7959599 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7961617) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21813 + ... + 22174.

It is an arithmetic number, because the mean of its divisors is an integer number (2001454).

Almost surely, 2^7961647 is an apocalyptic number.

7961647 is a deficient number, since it is larger than the sum of its proper divisors (44169).

7961647 is a wasteful number, since it uses less digits than its factorization.

7961647 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 44168.

The product of its digits is 63504, while the sum is 40.

The square root of 7961647 is about 2821.6390626726. The cubic root of 7961647 is about 199.6798795545.

The spelling of 7961647 in words is "seven million, nine hundred sixty-one thousand, six hundred forty-seven".