78586213 has 2 divisors, whose sum is σ = 78586214. Its totient is φ = 78586212.

The previous prime is 78586163. The next prime is 78586229. The reversal of 78586213 is 31268587.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 59243809 + 19342404 = 7697^2 + 4398^2 .

It is a cyclic number.

It is not a de Polignac number, because 78586213 - 2¹³ = 78578021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78586253) 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, 39293106 + 39293107.

It is an arithmetic number, because the mean of its divisors is an integer number (39293107).

Almost surely, 2^78586213 is an apocalyptic number.

It is an amenable number.

78586213 is a deficient number, since it is larger than the sum of its proper divisors (1).

78586213 is an equidigital number, since it uses as much as digits as its factorization.

78586213 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 80640, while the sum is 40.

The square root of 78586213 is about 8864.8865192962. The cubic root of 78586213 is about 428.3335773271. Note that the first 3 decimals are identical.

The spelling of 78586213 in words is "seventy-eight million, five hundred eighty-six thousand, two hundred thirteen".