78709061 has 2 divisors, whose sum is σ = 78709062. Its totient is φ = 78709060.

The previous prime is 78709051. The next prime is 78709091. The reversal of 78709061 is 16090787.

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., 77986561 + 722500 = 8831^2 + 850^2 .

It is a cyclic number.

It is not a de Polignac number, because 78709061 - 2¹⁸ = 78446917 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78709021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39354530 + 39354531.

It is an arithmetic number, because the mean of its divisors is an integer number (39354531).

Almost surely, 2^78709061 is an apocalyptic number.

It is an amenable number.

78709061 is a deficient number, since it is larger than the sum of its proper divisors (1).

78709061 is an equidigital number, since it uses as much as digits as its factorization.

78709061 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 21168, while the sum is 38.

The square root of 78709061 is about 8871.8127234517. The cubic root of 78709061 is about 428.5566551680.

The spelling of 78709061 in words is "seventy-eight million, seven hundred nine thousand, sixty-one".