78785983 has 2 divisors, whose sum is σ = 78785984. Its totient is φ = 78785982.

The previous prime is 78785981. The next prime is 78786031. The reversal of 78785983 is 38958787.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78785983 - 2¹ = 78785981 is a prime.

It is a super-2 number, since 2×78785983² = 12414462234552578, which contains 22 as substring.

Together with 78785981, 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 (78785981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39392991 + 39392992.

It is an arithmetic number, because the mean of its divisors is an integer number (39392992).

Almost surely, 2^78785983 is an apocalyptic number.

78785983 is a deficient number, since it is larger than the sum of its proper divisors (1).

78785983 is an equidigital number, since it uses as much as digits as its factorization.

78785983 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3386880, while the sum is 55.

The square root of 78785983 is about 8876.1468554773. The cubic root of 78785983 is about 428.6962185230.

It can be divided in two parts, 7878 and 5983, that added together give a triangular number (13861 = T₁₆₆).

The spelling of 78785983 in words is "seventy-eight million, seven hundred eighty-five thousand, nine hundred eighty-three".