6638765 has 24 divisors (see below), whose sum is σ = 9411840. Its totient is φ = 4494672.

The previous prime is 6638741. The next prime is 6638773. The reversal of 6638765 is 5678366.

It is not a de Polignac number, because 6638765 - 2⁶ = 6638701 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 83996 + ... + 84074.

It is an arithmetic number, because the mean of its divisors is an integer number (392160).

Almost surely, 2^6638765 is an apocalyptic number.

It is an amenable number.

6638765 is a deficient number, since it is larger than the sum of its proper divisors (2773075).

6638765 is an frugal number, since it uses more digits than its factorization.

6638765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 119 (or 91 counting only the distinct ones).

The product of its digits is 181440, while the sum is 41.

The square root of 6638765 is about 2576.5800977264. The cubic root of 6638765 is about 187.9442738864.

The spelling of 6638765 in words is "six million, six hundred thirty-eight thousand, seven hundred sixty-five".