78069823 has 4 divisors (see below), whose sum is σ = 84075208. Its totient is φ = 72064440.

The previous prime is 78069713. The next prime is 78069829. The reversal of 78069823 is 32896087.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 78069823 - 2¹³ = 78061631 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 78069823.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78069829) 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 in 3 ways as a sum of consecutive naturals, for example, 3002673 + ... + 3002698.

It is an arithmetic number, because the mean of its divisors is an integer number (21018802).

Almost surely, 2^78069823 is an apocalyptic number.

78069823 is a deficient number, since it is larger than the sum of its proper divisors (6005385).

78069823 is a wasteful number, since it uses less digits than its factorization.

78069823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6005384.

The product of its (nonzero) digits is 145152, while the sum is 43.

The square root of 78069823 is about 8835.7129310543. The cubic root of 78069823 is about 427.3933215343.

The spelling of 78069823 in words is "seventy-eight million, sixty-nine thousand, eight hundred twenty-three".