78349823 has 8 divisors (see below), whose sum is σ = 79232736. Its totient is φ = 77472000.

The previous prime is 78349819. The next prime is 78349829. The reversal of 78349823 is 32894387.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 78349823 - 2² = 78349819 is a prime.

It is a super-2 number, since 2×78349823² = 12277389528262658, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78349829) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35315 + ... + 37467.

It is an arithmetic number, because the mean of its divisors is an integer number (9904092).

Almost surely, 2^78349823 is an apocalyptic number.

78349823 is a deficient number, since it is larger than the sum of its proper divisors (882913).

78349823 is a wasteful number, since it uses less digits than its factorization.

78349823 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2545.

The product of its digits is 290304, while the sum is 44.

The square root of 78349823 is about 8851.5435377114. The cubic root of 78349823 is about 427.9036653218.

The spelling of 78349823 in words is "seventy-eight million, three hundred forty-nine thousand, eight hundred twenty-three".