6540642 has 16 divisors (see below), whose sum is σ = 14534880. Its totient is φ = 2180196.

The previous prime is 6540637. The next prime is 6540643. The reversal of 6540642 is 2460456.

It is a happy number.

6540642 is a `hidden beast` number, since 654 + 0 + 6 + 4 + 2 = 666.

6540642 is digitally balanced in base 4, because in such base it contains all the possibile digits an equal number of times.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (6540643) 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, 60508 + ... + 60615.

It is an arithmetic number, because the mean of its divisors is an integer number (908430).

Almost surely, 2^6540642 is an apocalyptic number.

6540642 is an abundant number, since it is smaller than the sum of its proper divisors (7994238).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6540642 is a wasteful number, since it uses less digits than its factorization.

6540642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 121134 (or 121128 counting only the distinct ones).

The product of its (nonzero) digits is 5760, while the sum is 27.

The square root of 6540642 is about 2557.4678883615. The cubic root of 6540642 is about 187.0137159051.

The spelling of 6540642 in words is "six million, five hundred forty thousand, six hundred forty-two".