78416771 has 2 divisors, whose sum is σ = 78416772. Its totient is φ = 78416770.

The previous prime is 78416749. The next prime is 78416773. The reversal of 78416771 is 17761487.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78416771 - 2⁶ = 78416707 is a prime.

It is a super-2 number, since 2×78416771² = 12298379948132882, which contains 22 as substring.

Together with 78416773, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (78416773) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39208385 + 39208386.

It is an arithmetic number, because the mean of its divisors is an integer number (39208386).

Almost surely, 2^78416771 is an apocalyptic number.

78416771 is a deficient number, since it is larger than the sum of its proper divisors (1).

78416771 is an equidigital number, since it uses as much as digits as its factorization.

78416771 is an evil number, because the sum of its binary digits is even.

The product of its digits is 65856, while the sum is 41.

The square root of 78416771 is about 8855.3244435198. The cubic root of 78416771 is about 428.0255083496.

The spelling of 78416771 in words is "seventy-eight million, four hundred sixteen thousand, seven hundred seventy-one".