78479369 has 2 divisors, whose sum is σ = 78479370. Its totient is φ = 78479368.

The previous prime is 78479351. The next prime is 78479377. The reversal of 78479369 is 96397487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71910400 + 6568969 = 8480^2 + 2563^2 .

It is a cyclic number.

It is not a de Polignac number, because 78479369 - 2⁸ = 78479113 is a prime.

It is a super-2 number, since 2×78479369² = 12318022717276322, which contains 22 as substring.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78479369.

It is not a weakly prime, because it can be changed into another prime (78479669) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39239684 + 39239685.

It is an arithmetic number, because the mean of its divisors is an integer number (39239685).

Almost surely, 2^78479369 is an apocalyptic number.

It is an amenable number.

78479369 is a deficient number, since it is larger than the sum of its proper divisors (1).

78479369 is an equidigital number, since it uses as much as digits as its factorization.

78479369 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2286144, while the sum is 53.

The square root of 78479369 is about 8858.8582221413. The cubic root of 78479369 is about 428.1393718087.

The spelling of 78479369 in words is "seventy-eight million, four hundred seventy-nine thousand, three hundred sixty-nine".