6639545 has 16 divisors (see below), whose sum is σ = 8838720. Its totient is φ = 4747200.

The previous prime is 6639533. The next prime is 6639547. The reversal of 6639545 is 5459366.

6639545 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 6639545 - 2⁶ = 6639481 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 6639499 and 6639508.

It is not an unprimeable number, because it can be changed into a prime (6639547) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2366 + ... + 4344.

It is an arithmetic number, because the mean of its divisors is an integer number (552420).

Almost surely, 2^6639545 is an apocalyptic number.

It is an amenable number.

6639545 is a deficient number, since it is larger than the sum of its proper divisors (2199175).

6639545 is a wasteful number, since it uses less digits than its factorization.

6639545 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2056.

The product of its digits is 97200, while the sum is 38.

The square root of 6639545 is about 2576.7314567102. The cubic root of 6639545 is about 187.9516342310.

The spelling of 6639545 in words is "six million, six hundred thirty-nine thousand, five hundred forty-five".