7638685 has 4 divisors (see below), whose sum is σ = 9166428. Its totient is φ = 6110944.

The previous prime is 7638643. The next prime is 7638689. The reversal of 7638685 is 5868367.

7638685 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, and also an emirpimes, since its reverse is a distinct semiprime: 5868367 = 1193 ⋅4919.

It can be written as a sum of positive squares in 2 ways, for example, as 2247001 + 5391684 = 1499^2 + 2322^2 .

It is a cyclic number.

It is not a de Polignac number, because 7638685 - 2⁷ = 7638557 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 (7638689) 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, 763864 + ... + 763873.

It is an arithmetic number, because the mean of its divisors is an integer number (2291607).

Almost surely, 2^7638685 is an apocalyptic number.

It is an amenable number.

7638685 is a deficient number, since it is larger than the sum of its proper divisors (1527743).

7638685 is a wasteful number, since it uses less digits than its factorization.

7638685 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1527742.

The product of its digits is 241920, while the sum is 43.

The square root of 7638685 is about 2763.8171068289. The cubic root of 7638685 is about 196.9425395216.

The spelling of 7638685 in words is "seven million, six hundred thirty-eight thousand, six hundred eighty-five".