2639904005 has 16 divisors (see below), whose sum is σ = 3323908224. Its totient is φ = 2008923840.

The previous prime is 2639903989. The next prime is 2639904049. The reversal of 2639904005 is 5004099362.

It is not a de Polignac number, because 2639904005 - 2⁴ = 2639903989 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 2639904005.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 42599 + ... + 84228.

It is an arithmetic number, because the mean of its divisors is an integer number (207744264).

Almost surely, 2^2639904005 is an apocalyptic number.

It is an amenable number.

2639904005 is a deficient number, since it is larger than the sum of its proper divisors (684004219).

2639904005 is a wasteful number, since it uses less digits than its factorization.

2639904005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 127036.

The product of its (nonzero) digits is 58320, while the sum is 38.

The square root of 2639904005 is about 51379.9961560917. The cubic root of 2639904005 is about 1382.0678941306.

The spelling of 2639904005 in words is "two billion, six hundred thirty-nine million, nine hundred four thousand, five".