78857413 has 2 divisors, whose sum is σ = 78857414. Its totient is φ = 78857412.

The previous prime is 78857381. The next prime is 78857419. The reversal of 78857413 is 31475887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 55980324 + 22877089 = 7482^2 + 4783^2 .

It is a cyclic number.

It is not a de Polignac number, because 78857413 - 2⁵ = 78857381 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78857413.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78857419) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39428706 + 39428707.

It is an arithmetic number, because the mean of its divisors is an integer number (39428707).

Almost surely, 2^78857413 is an apocalyptic number.

It is an amenable number.

78857413 is a deficient number, since it is larger than the sum of its proper divisors (1).

78857413 is an equidigital number, since it uses as much as digits as its factorization.

78857413 is an evil number, because the sum of its binary digits is even.

The product of its digits is 188160, while the sum is 43.

The square root of 78857413 is about 8880.1696492804. The cubic root of 78857413 is about 428.8257361527.

The spelling of 78857413 in words is "seventy-eight million, eight hundred fifty-seven thousand, four hundred thirteen".