7680665 has 4 divisors (see below), whose sum is σ = 9216804. Its totient is φ = 6144528.

The previous prime is 7680649. The next prime is 7680667. The reversal of 7680665 is 5660867.

7680665 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5004169 + 2676496 = 2237^2 + 1636^2 .

It is a cyclic number.

It is not a de Polignac number, because 7680665 - 2⁴ = 7680649 is a prime.

It is a super-2 number, since 2×7680665² = 117985229684450, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (7680667) 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, 768062 + ... + 768071.

It is an arithmetic number, because the mean of its divisors is an integer number (2304201).

Almost surely, 2^7680665 is an apocalyptic number.

It is an amenable number.

7680665 is a deficient number, since it is larger than the sum of its proper divisors (1536139).

7680665 is a wasteful number, since it uses less digits than its factorization.

7680665 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1536138.

The product of its (nonzero) digits is 60480, while the sum is 38.

The square root of 7680665 is about 2771.4012701159. The cubic root of 7680665 is about 197.3026603343.

The spelling of 7680665 in words is "seven million, six hundred eighty thousand, six hundred sixty-five".