7638428449 has 2 divisors, whose sum is σ = 7638428450. Its totient is φ = 7638428448.

The previous prime is 7638428443. The next prime is 7638428459. The reversal of 7638428449 is 9448248367.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5213850849 + 2424577600 = 72207^2 + 49240^2 .

It is a cyclic number.

It is not a de Polignac number, because 7638428449 - 2⁵ = 7638428417 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 7638428449.

It is not a weakly prime, because it can be changed into another prime (7638428443) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3819214224 + 3819214225.

It is an arithmetic number, because the mean of its divisors is an integer number (3819214225).

Almost surely, 2^7638428449 is an apocalyptic number.

It is an amenable number.

7638428449 is a deficient number, since it is larger than the sum of its proper divisors (1).

7638428449 is an equidigital number, since it uses as much as digits as its factorization.

7638428449 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9289728, while the sum is 55.

The square root of 7638428449 is about 87398.1032345668. The cubic root of 7638428449 is about 1969.4033467565.

The spelling of 7638428449 in words is "seven billion, six hundred thirty-eight million, four hundred twenty-eight thousand, four hundred forty-nine".