2639275240 has 80 divisors (see below), whose sum is σ = 6927937380. Its totient is φ = 904861440.

The previous prime is 2639275229. The next prime is 2639275259. The reversal of 2639275240 is 425729362.

It can be written as a sum of positive squares in 2 ways, for example, as 2507806084 + 131469156 = 50078^2 + 11466^2 .

It is a Harshad number since it is a multiple of its sum of digits (40).

It is a junction number, because it is equal to n+sod(n) for n = 2639275193 and 2639275202.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 82300 + ... + 109780.

Almost surely, 2^2639275240 is an apocalyptic number.

2639275240 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 2639275240, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (3463968690).

2639275240 is an abundant number, since it is smaller than the sum of its proper divisors (4288662140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

2639275240 is an equidigital number, since it uses as much as digits as its factorization.

2639275240 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 27520 (or 27495 counting only the distinct ones).

The product of its (nonzero) digits is 181440, while the sum is 40.

The square root of 2639275240 is about 51373.8770193568. The cubic root of 2639275240 is about 1381.9581597212.

The spelling of 2639275240 in words is "two billion, six hundred thirty-nine million, two hundred seventy-five thousand, two hundred forty".