2638878349 has 2 divisors, whose sum is σ = 2638878350. Its totient is φ = 2638878348.

The previous prime is 2638878271. The next prime is 2638878353. The reversal of 2638878349 is 9438788362.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2167554249 + 471324100 = 46557^2 + 21710^2 .

It is a cyclic number.

It is not a de Polignac number, because 2638878349 - 2¹⁷ = 2638747277 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2638878293 and 2638878302.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2638876349) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1319439174 + 1319439175.

It is an arithmetic number, because the mean of its divisors is an integer number (1319439175).

Almost surely, 2^2638878349 is an apocalyptic number.

It is an amenable number.

2638878349 is a deficient number, since it is larger than the sum of its proper divisors (1).

2638878349 is an equidigital number, since it uses as much as digits as its factorization.

2638878349 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13934592, while the sum is 58.

The square root of 2638878349 is about 51370.0141035605. The cubic root of 2638878349 is about 1381.8888838529. Note that the first 5 decimals are identical.

The spelling of 2638878349 in words is "two billion, six hundred thirty-eight million, eight hundred seventy-eight thousand, three hundred forty-nine".