6540638 has 24 divisors (see below), whose sum is σ = 10931688. Its totient is φ = 2931552.

The previous prime is 6540637. The next prime is 6540643. The reversal of 6540638 is 8360456.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6540637) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 12245 + ... + 12767.

It is an arithmetic number, because the mean of its divisors is an integer number (455487).

Almost surely, 2^6540638 is an apocalyptic number.

6540638 is a deficient number, since it is larger than the sum of its proper divisors (4391050).

6540638 is a wasteful number, since it uses less digits than its factorization.

6540638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 588 (or 575 counting only the distinct ones).

The product of its (nonzero) digits is 17280, while the sum is 32.

The square root of 6540638 is about 2557.4671063378. The cubic root of 6540638 is about 187.0136777817.

The spelling of 6540638 in words is "six million, five hundred forty thousand, six hundred thirty-eight".