78885493 has 2 divisors, whose sum is σ = 78885494. Its totient is φ = 78885492.

The previous prime is 78885487. The next prime is 78885503. The reversal of 78885493 is 39458887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 58110129 + 20775364 = 7623^2 + 4558^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78885493 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78885493.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78885403) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39442746 + 39442747.

It is an arithmetic number, because the mean of its divisors is an integer number (39442747).

Almost surely, 2^78885493 is an apocalyptic number.

It is an amenable number.

78885493 is a deficient number, since it is larger than the sum of its proper divisors (1).

78885493 is an equidigital number, since it uses as much as digits as its factorization.

78885493 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1935360, while the sum is 52.

The square root of 78885493 is about 8881.7505594337. The cubic root of 78885493 is about 428.8766296884.

The spelling of 78885493 in words is "seventy-eight million, eight hundred eighty-five thousand, four hundred ninety-three".