78556213 has 2 divisors, whose sum is σ = 78556214. Its totient is φ = 78556212.

The previous prime is 78556189. The next prime is 78556237. The reversal of 78556213 is 31265587.

It is a balanced prime because it is at equal distance from previous prime (78556189) and next prime (78556237).

It can be written as a sum of positive squares in only one way, i.e., 75377124 + 3179089 = 8682^2 + 1783^2 .

It is an emirp because it is prime and its reverse (31265587) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78556213 - 2¹³ = 78548021 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78556243) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39278106 + 39278107.

It is an arithmetic number, because the mean of its divisors is an integer number (39278107).

Almost surely, 2^78556213 is an apocalyptic number.

It is an amenable number.

78556213 is a deficient number, since it is larger than the sum of its proper divisors (1).

78556213 is an equidigital number, since it uses as much as digits as its factorization.

78556213 is an evil number, because the sum of its binary digits is even.

The product of its digits is 50400, while the sum is 37.

The square root of 78556213 is about 8863.1942887426. The cubic root of 78556213 is about 428.2790654633.

The spelling of 78556213 in words is "seventy-eight million, five hundred fifty-six thousand, two hundred thirteen".