6480639 has 24 divisors (see below), whose sum is σ = 10315344. Its totient is φ = 3920400.

The previous prime is 6480637. The next prime is 6480697. The reversal of 6480639 is 9360846.

6480639 = T₄₂ + T₄₃ + ... + T₃₃₈.

6480639 is a `hidden beast` number, since 648 + 0 + 6 + 3 + 9 = 666.

It is not a de Polignac number, because 6480639 - 2¹ = 6480637 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6480631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 11709 + ... + 12249.

It is an arithmetic number, because the mean of its divisors is an integer number (429806).

Almost surely, 2^6480639 is an apocalyptic number.

6480639 is a deficient number, since it is larger than the sum of its proper divisors (3834705).

6480639 is a wasteful number, since it uses less digits than its factorization.

6480639 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 580 (or 555 counting only the distinct ones).

The product of its (nonzero) digits is 31104, while the sum is 36.

The square root of 6480639 is about 2545.7099206312. The cubic root of 6480639 is about 186.4400783088.

The spelling of 6480639 in words is "six million, four hundred eighty thousand, six hundred thirty-nine".