78839953 has 2 divisors, whose sum is σ = 78839954. Its totient is φ = 78839952.

The previous prime is 78839947. The next prime is 78840023. The reversal of 78839953 is 35993887.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43401744 + 35438209 = 6588^2 + 5953^2 .

It is a cyclic number.

It is not a de Polignac number, because 78839953 - 2²¹ = 76742801 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78839953.

It is not a weakly prime, because it can be changed into another prime (78839153) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39419976 + 39419977.

It is an arithmetic number, because the mean of its divisors is an integer number (39419977).

Almost surely, 2^78839953 is an apocalyptic number.

It is an amenable number.

78839953 is a deficient number, since it is larger than the sum of its proper divisors (1).

78839953 is an equidigital number, since it uses as much as digits as its factorization.

78839953 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 52.

The square root of 78839953 is about 8879.1865055308. The cubic root of 78839953 is about 428.7940847212.

The spelling of 78839953 in words is "seventy-eight million, eight hundred thirty-nine thousand, nine hundred fifty-three".