78834617 has 2 divisors, whose sum is σ = 78834618. Its totient is φ = 78834616.

The previous prime is 78834571. The next prime is 78834647. The reversal of 78834617 is 71643887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40691641 + 38142976 = 6379^2 + 6176^2 .

It is a cyclic number.

It is not a de Polignac number, because 78834617 - 2¹⁶ = 78769081 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78834647) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39417308 + 39417309.

It is an arithmetic number, because the mean of its divisors is an integer number (39417309).

Almost surely, 2^78834617 is an apocalyptic number.

It is an amenable number.

78834617 is a deficient number, since it is larger than the sum of its proper divisors (1).

78834617 is an equidigital number, since it uses as much as digits as its factorization.

78834617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 225792, while the sum is 44.

The square root of 78834617 is about 8878.8860224693. The cubic root of 78834617 is about 428.7844107054.

The spelling of 78834617 in words is "seventy-eight million, eight hundred thirty-four thousand, six hundred seventeen".