2640275779 has 4 divisors (see below), whose sum is σ = 2654863120. Its totient is φ = 2625688440.

The previous prime is 2640275773. The next prime is 2640275821. The reversal of 2640275779 is 9775720462.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 9775720462 = 2 ⋅4887860231.

It is a cyclic number.

It is not a de Polignac number, because 2640275779 - 2⁵ = 2640275747 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (2640275773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7293399 + ... + 7293760.

It is an arithmetic number, because the mean of its divisors is an integer number (663715780).

Almost surely, 2^2640275779 is an apocalyptic number.

2640275779 is a deficient number, since it is larger than the sum of its proper divisors (14587341).

2640275779 is a wasteful number, since it uses less digits than its factorization.

2640275779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 14587340.

The product of its (nonzero) digits is 1481760, while the sum is 49.

The square root of 2640275779 is about 51383.6139153330. The cubic root of 2640275779 is about 1382.1327693167.

The spelling of 2640275779 in words is "two billion, six hundred forty million, two hundred seventy-five thousand, seven hundred seventy-nine".