7686645 has 8 divisors (see below), whose sum is σ = 12298656. Its totient is φ = 4099536.

The previous prime is 7686631. The next prime is 7686649. The reversal of 7686645 is 5466867.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 7686645 - 2¹³ = 7678453 is a prime.

It is a super-2 number, since 2×7686645² = 118169022712050, which contains 22 as substring.

It is a Curzon number.

7686645 is a lucky number.

It is a junction number, because it is equal to n+sod(n) for n = 7686597 and 7686606.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (7686649) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 256207 + ... + 256236.

It is an arithmetic number, because the mean of its divisors is an integer number (1537332).

Almost surely, 2^7686645 is an apocalyptic number.

It is an amenable number.

7686645 is a deficient number, since it is larger than the sum of its proper divisors (4612011).

7686645 is a wasteful number, since it uses less digits than its factorization.

7686645 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 512451.

The product of its digits is 241920, while the sum is 42.

The square root of 7686645 is about 2772.4799368075. The cubic root of 7686645 is about 197.3538522486.

The spelling of 7686645 in words is "seven million, six hundred eighty-six thousand, six hundred forty-five".