78127823 has 2 divisors, whose sum is σ = 78127824. Its totient is φ = 78127822.

The previous prime is 78127811. The next prime is 78127891. The reversal of 78127823 is 32872187.

It is a weak prime.

It is an emirp because it is prime and its reverse (32872187) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78127823 - 2⁴ = 78127807 is a prime.

It is a super-2 number, since 2×78127823² = 12207913453438658, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78127523) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39063911 + 39063912.

It is an arithmetic number, because the mean of its divisors is an integer number (39063912).

Almost surely, 2^78127823 is an apocalyptic number.

78127823 is a deficient number, since it is larger than the sum of its proper divisors (1).

78127823 is an equidigital number, since it uses as much as digits as its factorization.

78127823 is an evil number, because the sum of its binary digits is even.

The product of its digits is 37632, while the sum is 38.

The square root of 78127823 is about 8838.9944563847. The cubic root of 78127823 is about 427.4991356867.

The spelling of 78127823 in words is "seventy-eight million, one hundred twenty-seven thousand, eight hundred twenty-three".