78916837 has 2 divisors, whose sum is σ = 78916838. Its totient is φ = 78916836.

The previous prime is 78916811. The next prime is 78916853. The reversal of 78916837 is 73861987.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64545156 + 14371681 = 8034^2 + 3791^2 .

It is a cyclic number.

It is not a de Polignac number, because 78916837 - 2¹⁹ = 78392549 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78916637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39458418 + 39458419.

It is an arithmetic number, because the mean of its divisors is an integer number (39458419).

Almost surely, 2^78916837 is an apocalyptic number.

It is an amenable number.

78916837 is a deficient number, since it is larger than the sum of its proper divisors (1).

78916837 is an equidigital number, since it uses as much as digits as its factorization.

78916837 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 508032, while the sum is 49.

The square root of 78916837 is about 8883.5149012089. The cubic root of 78916837 is about 428.9334247912.

The spelling of 78916837 in words is "seventy-eight million, nine hundred sixteen thousand, eight hundred thirty-seven".