2640707078 has 4 divisors (see below), whose sum is σ = 3961060620. Its totient is φ = 1320353538.

The previous prime is 2640707051. The next prime is 2640707093. The reversal of 2640707078 is 8707070462.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 8707070462 = 2 ⋅4353535231.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 660176768 + ... + 660176771.

It is an arithmetic number, because the mean of its divisors is an integer number (990265155).

Almost surely, 2^2640707078 is an apocalyptic number.

2640707078 is a deficient number, since it is larger than the sum of its proper divisors (1320353542).

2640707078 is a wasteful number, since it uses less digits than its factorization.

2640707078 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1320353541.

The product of its (nonzero) digits is 131712, while the sum is 41.

The square root of 2640707078 is about 51387.8105974559. The cubic root of 2640707078 is about 1382.2080240849.

The spelling of 2640707078 in words is "two billion, six hundred forty million, seven hundred seven thousand, seventy-eight".