7688645 has 4 divisors (see below), whose sum is σ = 9226380. Its totient is φ = 6150912.

The previous prime is 7688627. The next prime is 7688663. The reversal of 7688645 is 5468867.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5468867 = 41 ⋅133387.

It is an interprime number because it is at equal distance from previous prime (7688627) and next prime (7688663).

It can be written as a sum of positive squares in 2 ways, for example, as 4761124 + 2927521 = 2182^2 + 1711^2 .

It is a cyclic number.

It is not a de Polignac number, because 7688645 - 2⁶ = 7688581 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 7688596 and 7688605.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 768860 + ... + 768869.

It is an arithmetic number, because the mean of its divisors is an integer number (2306595).

Almost surely, 2^7688645 is an apocalyptic number.

It is an amenable number.

7688645 is a deficient number, since it is larger than the sum of its proper divisors (1537735).

7688645 is a wasteful number, since it uses less digits than its factorization.

7688645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1537734.

The product of its digits is 322560, while the sum is 44.

The square root of 7688645 is about 2772.8406012607. The cubic root of 7688645 is about 197.3709673652.

The spelling of 7688645 in words is "seven million, six hundred eighty-eight thousand, six hundred forty-five".