78863399 has 2 divisors, whose sum is σ = 78863400. Its totient is φ = 78863398.

The previous prime is 78863381. The next prime is 78863401. The reversal of 78863399 is 99336887.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78863399 - 2⁸ = 78863143 is a prime.

Together with 78863401, it forms a pair of twin primes.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 78863399.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78863339) by changing a digit.

It is a good prime.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39431699 + 39431700.

It is an arithmetic number, because the mean of its divisors is an integer number (39431700).

Almost surely, 2^78863399 is an apocalyptic number.

78863399 is a deficient number, since it is larger than the sum of its proper divisors (1).

78863399 is an equidigital number, since it uses as much as digits as its factorization.

78863399 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1959552, while the sum is 53.

The square root of 78863399 is about 8880.5066859949. The cubic root of 78863399 is about 428.8365864786.

The spelling of 78863399 in words is "seventy-eight million, eight hundred sixty-three thousand, three hundred ninety-nine".