78635983 has 2 divisors, whose sum is σ = 78635984. Its totient is φ = 78635982.

The previous prime is 78635981. The next prime is 78636013. The reversal of 78635983 is 38953687.

It is a weak prime.

It is an emirp because it is prime and its reverse (38953687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78635983 - 2¹ = 78635981 is a prime.

Together with 78635981, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78635981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39317991 + 39317992.

It is an arithmetic number, because the mean of its divisors is an integer number (39317992).

Almost surely, 2^78635983 is an apocalyptic number.

78635983 is a deficient number, since it is larger than the sum of its proper divisors (1).

78635983 is an equidigital number, since it uses as much as digits as its factorization.

78635983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1088640, while the sum is 49.

The square root of 78635983 is about 8867.6932175172. The cubic root of 78635983 is about 428.4239819182.

The spelling of 78635983 in words is "seventy-eight million, six hundred thirty-five thousand, nine hundred eighty-three".