2638778347 has 2 divisors, whose sum is σ = 2638778348. Its totient is φ = 2638778346.

The previous prime is 2638778341. The next prime is 2638778371. The reversal of 2638778347 is 7438778362.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2638778347 - 2²³ = 2630389739 is a prime.

It is not a weakly prime, because it can be changed into another prime (2638778341) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319389173 + 1319389174.

It is an arithmetic number, because the mean of its divisors is an integer number (1319389174).

Almost surely, 2^2638778347 is an apocalyptic number.

2638778347 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638778347 is an equidigital number, since it uses as much as digits as its factorization.

2638778347 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9483264, while the sum is 55.

The square root of 2638778347 is about 51369.0407444017. The cubic root of 2638778347 is about 1381.8714277750.

The spelling of 2638778347 in words is "two billion, six hundred thirty-eight million, seven hundred seventy-eight thousand, three hundred forty-seven".