78457663 has 2 divisors, whose sum is σ = 78457664. Its totient is φ = 78457662.

The previous prime is 78457661. The next prime is 78457681. The reversal of 78457663 is 36675487.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78457663 - 2¹ = 78457661 is a prime.

Together with 78457661, 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 (78457661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39228831 + 39228832.

It is an arithmetic number, because the mean of its divisors is an integer number (39228832).

Almost surely, 2^78457663 is an apocalyptic number.

78457663 is a deficient number, since it is larger than the sum of its proper divisors (1).

78457663 is an equidigital number, since it uses as much as digits as its factorization.

78457663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 846720, while the sum is 46.

The square root of 78457663 is about 8857.6330359752. The cubic root of 78457663 is about 428.0998962530.

The spelling of 78457663 in words is "seventy-eight million, four hundred fifty-seven thousand, six hundred sixty-three".