7978794269 has 2 divisors, whose sum is σ = 7978794270. Its totient is φ = 7978794268.

The previous prime is 7978794209. The next prime is 7978794283. The reversal of 7978794269 is 9624978797.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4008156100 + 3970638169 = 63310^2 + 63013^2 .

It is a cyclic number.

It is not a de Polignac number, because 7978794269 - 2¹² = 7978790173 is a prime.

It is a super-2 number, since 2×7978794269² (a number of 21 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 7978794199 and 7978794208.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (7978794209) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3989397134 + 3989397135.

It is an arithmetic number, because the mean of its divisors is an integer number (3989397135).

Almost surely, 2^7978794269 is an apocalyptic number.

It is an amenable number.

7978794269 is a deficient number, since it is larger than the sum of its proper divisors (1).

7978794269 is an equidigital number, since it uses as much as digits as its factorization.

7978794269 is an evil number, because the sum of its binary digits is even.

The product of its digits is 96018048, while the sum is 68.

The square root of 7978794269 is about 89324.0967992400. The cubic root of 7978794269 is about 1998.2312920472.

The spelling of 7978794269 in words is "seven billion, nine hundred seventy-eight million, seven hundred ninety-four thousand, two hundred sixty-nine".