78671623 has 2 divisors, whose sum is σ = 78671624. Its totient is φ = 78671622.

The previous prime is 78671591. The next prime is 78671629. The reversal of 78671623 is 32617687.

It is a strong prime.

It is an emirp because it is prime and its reverse (32617687) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78671623 - 2⁵ = 78671591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78671629) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39335811 + 39335812.

It is an arithmetic number, because the mean of its divisors is an integer number (39335812).

Almost surely, 2^78671623 is an apocalyptic number.

78671623 is a deficient number, since it is larger than the sum of its proper divisors (1).

78671623 is an equidigital number, since it uses as much as digits as its factorization.

78671623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 84672, while the sum is 40.

The square root of 78671623 is about 8869.7025316523. The cubic root of 78671623 is about 428.4886966706.

The spelling of 78671623 in words is "seventy-eight million, six hundred seventy-one thousand, six hundred twenty-three".