78667823 has 12 divisors (see below), whose sum is σ = 90000120. Its totient is φ = 68341632.

The previous prime is 78667783. The next prime is 78667837. The reversal of 78667823 is 32876687.

It is not a de Polignac number, because 78667823 - 2¹⁰ = 78666799 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78667123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6713 + ... + 14226.

It is an arithmetic number, because the mean of its divisors is an integer number (7500010).

Almost surely, 2^78667823 is an apocalyptic number.

78667823 is a deficient number, since it is larger than the sum of its proper divisors (11332297).

78667823 is a wasteful number, since it uses less digits than its factorization.

78667823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20986 (or 20969 counting only the distinct ones).

The product of its digits is 677376, while the sum is 47.

The square root of 78667823 is about 8869.4883166956. The cubic root of 78667823 is about 428.4817975999.

The spelling of 78667823 in words is "seventy-eight million, six hundred sixty-seven thousand, eight hundred twenty-three".