2639240605 has 4 divisors (see below), whose sum is σ = 3167088732. Its totient is φ = 2111392480.

The previous prime is 2639240573. The next prime is 2639240623. The reversal of 2639240605 is 5060429362.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 1325105604 + 1314135001 = 36402^2 + 36251^2 .

It is not a de Polignac number, because 2639240605 - 2⁵ = 2639240573 is a prime.

It is a super-3 number, since 3×2639240605³ (a number of 29 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 263924056 + ... + 263924065.

It is an arithmetic number, because the mean of its divisors is an integer number (791772183).

Almost surely, 2^2639240605 is an apocalyptic number.

It is an amenable number.

2639240605 is a deficient number, since it is larger than the sum of its proper divisors (527848127).

2639240605 is an equidigital number, since it uses as much as digits as its factorization.

2639240605 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 527848126.

The product of its (nonzero) digits is 77760, while the sum is 37.

The square root of 2639240605 is about 51373.5399305907. The cubic root of 2639240605 is about 1381.9521145856.

Adding to 2639240605 its reverse (5060429362), we get a palindrome (7699669967).

The spelling of 2639240605 in words is "two billion, six hundred thirty-nine million, two hundred forty thousand, six hundred five".