7638865 has 32 divisors (see below), whose sum is σ = 10838016. Its totient is φ = 5114880.

The previous prime is 7638859. The next prime is 7638877. The reversal of 7638865 is 5688367.

It is not a de Polignac number, because 7638865 - 2¹⁵ = 7606097 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 34144 + ... + 34366.

It is an arithmetic number, because the mean of its divisors is an integer number (338688).

Almost surely, 2^7638865 is an apocalyptic number.

It is an amenable number.

7638865 is a deficient number, since it is larger than the sum of its proper divisors (3199151).

7638865 is a wasteful number, since it uses less digits than its factorization.

7638865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 289.

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

The square root of 7638865 is about 2763.8496702968. The cubic root of 7638865 is about 196.9440864449.

The spelling of 7638865 in words is "seven million, six hundred thirty-eight thousand, eight hundred sixty-five".