2640139015 has 16 divisors (see below), whose sum is σ = 3531085920. Its totient is φ = 1883243520.

The previous prime is 2640139013. The next prime is 2640139027. The reversal of 2640139015 is 5109310462.

It is not a de Polignac number, because 2640139015 - 2¹ = 2640139013 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (2640139013) by changing a digit.

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, 815766 + ... + 818995.

It is an arithmetic number, because the mean of its divisors is an integer number (220692870).

Almost surely, 2^2640139015 is an apocalyptic number.

2640139015 is a deficient number, since it is larger than the sum of its proper divisors (890946905).

2640139015 is a wasteful number, since it uses less digits than its factorization.

2640139015 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1634802.

The product of its (nonzero) digits is 6480, while the sum is 31.

The square root of 2640139015 is about 51382.2830847365. The cubic root of 2640139015 is about 1382.1089044776.

Adding to 2640139015 its reverse (5109310462), we get a palindrome (7749449477).

The spelling of 2640139015 in words is "two billion, six hundred forty million, one hundred thirty-nine thousand, fifteen".