76978169 has 2 divisors, whose sum is σ = 76978170. Its totient is φ = 76978168.

The previous prime is 76978163. The next prime is 76978189. The reversal of 76978169 is 96187967.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 53114944 + 23863225 = 7288^2 + 4885^2 .

It is an emirp because it is prime and its reverse (96187967) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-76978169 is a prime.

It is a super-2 number, since 2×76978169² = 11851277005185122, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 76978169.

It is not a weakly prime, because it can be changed into another prime (76978163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 38489084 + 38489085.

It is an arithmetic number, because the mean of its divisors is an integer number (38489085).

Almost surely, 2^76978169 is an apocalyptic number.

It is an amenable number.

76978169 is a deficient number, since it is larger than the sum of its proper divisors (1).

76978169 is an equidigital number, since it uses as much as digits as its factorization.

76978169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1143072, while the sum is 53.

The square root of 76978169 is about 8773.7203625372. The cubic root of 76978169 is about 425.3918766164.

The spelling of 76978169 in words is "seventy-six million, nine hundred seventy-eight thousand, one hundred sixty-nine".