78990713 has 2 divisors, whose sum is σ = 78990714. Its totient is φ = 78990712.

The previous prime is 78990673. The next prime is 78990727. The reversal of 78990713 is 31709987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 76597504 + 2393209 = 8752^2 + 1547^2 .

It is an emirp because it is prime and its reverse (31709987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78990713 - 2¹⁶ = 78925177 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (78990013) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39495356 + 39495357.

It is an arithmetic number, because the mean of its divisors is an integer number (39495357).

Almost surely, 2^78990713 is an apocalyptic number.

It is an amenable number.

78990713 is a deficient number, since it is larger than the sum of its proper divisors (1).

78990713 is an equidigital number, since it uses as much as digits as its factorization.

78990713 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 95256, while the sum is 44.

The square root of 78990713 is about 8887.6719673939. The cubic root of 78990713 is about 429.0672281049.

The spelling of 78990713 in words is "seventy-eight million, nine hundred ninety thousand, seven hundred thirteen".