78082709 has 2 divisors, whose sum is σ = 78082710. Its totient is φ = 78082708.

The previous prime is 78082679. The next prime is 78082729. The reversal of 78082709 is 90728087.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 77827684 + 255025 = 8822^2 + 505^2 .

It is an emirp because it is prime and its reverse (90728087) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78082709 - 2¹² = 78078613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78082729) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39041354 + 39041355.

It is an arithmetic number, because the mean of its divisors is an integer number (39041355).

Almost surely, 2^78082709 is an apocalyptic number.

It is an amenable number.

78082709 is a deficient number, since it is larger than the sum of its proper divisors (1).

78082709 is an equidigital number, since it uses as much as digits as its factorization.

78082709 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 56448, while the sum is 41.

The square root of 78082709 is about 8836.4421007553. The cubic root of 78082709 is about 427.4168350472.

The spelling of 78082709 in words is "seventy-eight million, eighty-two thousand, seven hundred nine".